Thank you to SirDarkon34_IF for this portion of the guide
http://cs2bus.com/sharedfiles/filedetails/?id=778567050

These Achievements are seen as the easiest achievements to obtain and are often achieved just by playing the game. There are eighteen bronze achievements, one of which is hidden.

Get a perfect score on the specified event
This includes Maya's Demon Calling, Sisters' Odd Ritual, Demon Attracting Balm, Her Majesty Shinobu, Shinobu in the Window, and Maya's Medical Care.

Follow each route until you come across an event.
When the event starts, you will have to search the girl's body for targets to shoot and gestures to complete. After a certain number are completed, you will have to complete a motion section where you move your cursor in certain ways or click rapidly. You will have to do this three times.

Make sure to find and shoot the targets quickly.
Complete gestures as soon as they appear. They are worth more than the targets and have a time limit.
Do not hit the girl(s) with your shots (A few are okay, but if you hit her enough, you wont get perfect)
Be ready to do a motion section after every break where the girl talks to you.
Play through the event until the third motion section so that you know the motions before trying to perfect it.
If you make a mistake, press esc (pause on controller) and hit retry.

Give a Girl Euphoria

Shoot a girl in her Euphoria spot.
When you mouse over a girl with your cursor, either red, orange, yellow, or pink text will pop up
If the text is red, shoot the head.
If the text is orange, shoot the chest.
If the text is yellow, shoot the waist
If the text is pink, shoot the legs.

Defeat 100 Demon Girls
The description for this achievement is a little misleading.
In order to get this achievement, you must defeat 100 possessed girls without hitting their demon.

To do this, you must hit the possessed girl many times without hitting the demon all the while avoiding her advances to you.
The best place I can find to grind this achievement is 2-1 in score attack. There are 6 relatively easy possessed girls to take out throughout the stage. Just keep replaying until you've hit 100.
Alternatively, do this achievement alongside another, more grind heavy achievement. It is easier to do this during a story route as the possessed girls go down with many less shots if you have the damage upgrades (Which are not given to you in score attack)
I would recommend doing this achievement while clearing the last few endings you missed or while doing the true love route.

Experience your first Doki-Doki mode

Keep shooting girls until the bar in the top left of the screen becomes full. Press F (Y for controller) and click on a girl to enter doki-doki mode

Fulfill 10 of the Girls' Requests

This guide by jorgemalgorn has the way to complete every request
http://cs2bus.com/sharedfiles/filedetails/?id=774273927
In the menu between levels, you can check your cellphone to find requests. Each request fits under one of three types:
Finding an item:
The request will either give a hint as to an area where the item is to be found, or will provide a hint as to who has the item. You must zoom in and shoot the sparkling circle in order to collect the item.

Examining a girl
The request will as you to look at a certain girl/number of girls in a certain way to achieve the request. Sometimes this may include looking at a girl long enough to get her measurements which is done by zooming into a girl's body and focussing on it for awhile.

Finding the Ghost
The request will ask you to search a certain area for a hidden ghost NPC. The ghost is only visible and targetable when zoomed in. You can find the ghost while not zoomed in by looking for a purple ghost flame.

Look at the cellphone before entering a level to see what to look for
Zoom in often

View your first ending.

Play through any girl's route to the very end. It does not matter whether or not you get thr true ending so long as you finish the route.

Give 500 Girls Euphoria

Fend off 500 girls in any way.
It does not matter if you hit their euphoria area, just as long as they are defeated.

Get a Combo of 30 Ecstasy Shots

To get a combo, only defeat girls by hitting them in their euphoria spot. If you finish off a girl in a place they do not like, the combo will reset. You are, however, allowed to miss shots so long as they do not finish off the girl.

Do not buy the damage upgrades in the shop as euphoria shots will always 1-hit KO. This allows you to make a few mistakes in hitting the wrong spots without defeating the girl.
Take your time and aim.
Use Doki-Doki mode. Girls defeated by the explosion will count towards your combo.
Play on Beginner.

Fire 1000 Pheromone shots

Shoot 1000 times. This will unlock through regular gameplay.

Collect all of the panties from the changing room

Follow the Kurona route until Kurona asks you to go on the panty raid.
Shoot every panty item in the level to unlock the achievement.

As you move through the level, zoom into all possible lockers to find all the panties.
Disregard all the girls and aim for the panties first.
Disregard damage and accuracy, you can always retry if you want to do better after getting the achievement.
Use Doki-Doki mode to buy yourself more time.
The achievement unlocks as soon as you shoot the last panty. If Houdai begins leaving the room and the achievement has not unlocked, press esc (start on controller) and retry the level.

Get 100 Ecstacy Shots

Hit 100 girls in their euphoria area
See: Euphoric!

Experience your first Final Doki-Doki mode

Follow any girl's route to the very end to enter Final Doki-Doki mode.

View Aoi's Ending

Donate to Lovehearts in the academy store until the end unlocks.
The last donation level is at 9999 angel feathers.

These achievements are more difficult to achieve than the bronze achievements. Often, these achievements require multiple playthroughs to achieve.

Make 50+ girls experience "Double Peace"

In doki-doki mode, continue stimulating the girl(s) after their bar is full. Keep doing so until the game automatically completes doki-doki mode. Do not exit doki-doki mode on your own

Use doki-doki mode on one girl at a time. It is easier to achieve double peace when you only have to stimulate one girl at a time.

Obtain all images in the gallery

Complete every main girl's true ending
Complete Ekoro's bad ending
Complete Kurona's bad ending
Complete the Harem's bad ending
Obtain every CG event variant

To get true endings, raise the girl's afftection level above 75. See below true ending strategies.
To get bad endings, keep the girl's affection below 50%. Also, when in final Doki-doki mode, do not achieve double peace. See below the true ending strategies, and do the opposite.
To get the Harem bad ending, do not raise your affection with any girl high enough. Do this by choosing one of the lower personality traits in the beginning and buy only negative personality traits throughout the game. Do not use doki-doki mode as it will raise some stats. Avoid scoring ecstacy shots (although thats pretty hard at times)

(If you have all except the very last CG, look through each CG's variants by pressing a while looking at them. If a number is skipped, you need to go back to that event and try a different response (or fail the event, in Shinobu in the window's case)

Get a "Perfect!" score VS Mr. Demon Balloon

Follow routes until you encounter Mr. Demon Balloon.
In the first phase, zoom in to shoot the hanging bulb that the girl is holding on to.
Inside the balloon, shoot the tentacles without hitting the girl.
Second phase, repeat.
In the third phase, you will have to rotate the balloon. Do this by either waiting, or zooming in and shooting the balloon's eyes.

For the first two outside phases, do not worry about the projectiles, just shoot straight for the insides.
In the third outside phase, if you wait for him to turn, you will have to hit 3 projectiles in the meantime.
In the inside phases, be careful with your aiming as hitting the girl can cause you to lose perfection.
Press esc (start on controller) to retry if you make a mistake.

Get a "Perfect!" score VS Mr. Demon Veggie

Follow routes until you encounter Mr. Demon Veggie.
Zoom into the veggies to find the one with the girls inside (Not the daki or the statue)
Shoot the part holding her, not the actual girl.
Once inside, shoot the tentacles without hitting the girl.

In the inside phases, do not hit the girl, as that can cause you to lose perfection.
Press esc (start on controller) to retry if you make a mistake.

View ___'s true ending

To get a true ending, you must raise the affection with the girl above 75% and give them double peace in final doki-doki mode (raise the bar to full)
To do this, you must first answer correctly when the game prompts you for input in the conversations.
http://cs2bus.com/sharedfiles/filedetails/?id=772372408

Maya Route:
"I was just exercising my eyes"
"Leave the heavy lifting to me!"
"Your cute face is a mess..."
"*hug her tightly*"
"Show me where you're injured"
"Talk about what goes with rice"
"*stroke her*"
"I'll do whatver I can!"
"*keep quiet*"
"Here, let's rehydrate!"
"Thanks for telling me"
"Maya-chan is the stupid one!"


Shinobu Route:
"Teach her body directly"
"Try to be more captivating"
"*strokes*"
"I'd swipe the panties if they were yours"
"I love you"
"You're beautiful like a Goddess"
"Go right in!"
"I'll not pass off Shinobu to you!"
"I was worried about you"
"Show me your smile"
"I can't do that!"
"Maya-chan isn't weak!"


Ekoro Route:
"You activated my trap card!"
"Shout real loud! Scream "dumbass!""
"Gotta stop them, even by force"
"You're not a doll"
"Ekora is right, help Kurona first"
"I interested it for science"
"I wanna get more physical..."
"*shout in the 2nd controller's mic!*"
"Should I get you some medicine?"
"Will she really return to normal?"


Kurona Route:
"You activated my trap card!"
"Shout real loud! Scream "dumbass!""
"Gotta stop them, even by force"
"You're not a doll"
"We gotta go help!"
"It's a battle of wits!"
"Let's carry them to the infirmary!"
"Well done, Kurona-chan!"
"What's wrong with a make-up lesson?"

Patako Route:
Follow Kurona route until 6-1.
When Kurona realizes she misplaced her spear, opt not to help her.
In order to do this, you must have both halves of the halo ring obtained form completing the other true endings.

View the Sisters route's true ending

Choose the "I love both of them" option in the beginning.
When prompted for input in the conversations say:
"You two look great in your uniforms"
"The seal has been broken"
"You don't have to do it if it's bad"
"You got some nice air on that jump"
"You must be good at sports"
"How does this work?"
"That swimsuit looks good on you."
"You must be really motivated now"
"I'll back you guys up!"
"Let them go!"
"Did you see how brave I was?"
"I want the three of us to be happy"

View the true love route's true ending

Complete every main girl's route to unlock this route.
Choose "Unseen destiny" in the beginning.
Raise your affection to full with one or more girls to achieve the true ending.

Look at the new menu this mode adds to see what personality traits each girl likes.
In the levels, keep an eye out for the girl of your choice and make sure you use doki-doki mode on her.
Do not use doki-doki mode on other girls as this will adjust your personality traits to their tastes.
Make sure you always hit the girl you are after. Missing her causes her affection to drop.
You do not have to play through all 7 chapters to unlock this achievement.
If you raise your affection to full before the last chapter, the game will prompt you to ask if you want to skip to final doki-doki mode.

Recieve a "Perfect!" score VS Maya

The battle will begin with Maya throwing origami towards you. Shoot the origami out of the air.
While nothing is flying at you, shoot Maya.
Sometimes, the camera will look side to side and Maya will disappear. When this happens, zoom in and look through the pillars to find Maya.
Every few cycles, Maya will throw her Houdai-kun dolls into the air. They will rain down upon you and you will have to shoot them quickly.

Maya's weak spot is her head. Aim there to do critical damage.
You can still shoot Maya while she is behind the pillars. this is often the easiest time to hit criticals, as she is immobile for a moment.
Play on beginner difficulty to make the attacks easier.
Buy the damage upgrades in the academy store to defeat her faster.


Supposedly, you can achieve this in Event mode, but it is much harder than story mode as you have the lowest level pheremone shot. (credits to Scapegoat for this)

Recieve a "Perfect!" score VS Shinobu

The battle will begin with Shinobu shooting bullets towards you. Shoot the bullets out of the air.
While nothing is flying at you, shoot Shinobu.
Sometimes, the camera will look down and see a lewd magazine on the floor, when this happens, Shinobu will grab you and you will have to shoot her in specific places to break free.
Every few cycles, Shinobu will shoot rockets into the air. They will rain down upon you and you will have to shoot them quickly.

Shinobu's weak spot is her Waist. Aim for her skirt to do critical damage.
The colour of Shinobu's bullets dictate how many shots they take to repel. With full damage upgrades, however, you will not need to worry about this.
Play on beginner difficulty to make the attacks easier.
Buy the damage upgrades in the academy store to defeat her faster.


Supposedly, you can achieve this in Event mode, but it is much harder than story mode as you have the lowest level pheremone shot. (credits to Scapegoat for this)

Recieve a "Perfect!" score VS Shinobu & Maya

The battle is the same as the singular battles for Maya and Shinobu, but you will have to do them back to back.
See: Battle with the Bae: Maya, Battle with the Bae: Shinobu.


Supposedly, you can achieve this in Event mode, but it is much harder than story mode as you have the lowest level pheremone shot. (credits to Scapegoat for this)

Recieve a "Perfect!" score VS Ekoro

The battle will begin with Ekoro flying by and shooting bullets at you. Shoot them out of the air.
While nothing is flying at you, shoot Ekoro.
Sometimes, the camera will look up and Ekoro will fly towards you. You must shoot specific places on her to defend yourself.
Every few cycles, Ekoro will throw out Mr Happy's which will turn into girls. You must fend off the girls in a similar way to which you'd deal with a possessed girl.

Ekoro's weak spot is her head/halo. Aim there to do critical damage.
If you feel confident, shoot the Mr Happys out of the air before they can make a girl appear.
Take your time to ensure you do not miss too much.
Watch out for the flying kick, as there is not much time to hit the targets.
Play on beginner difficulty to make the attacks easier.
Buy the damage upgrades in the academy store to defeat her faster.


Supposedly, you can achieve this in Event mode, but it is much harder than story mode as you have the lowest level pheremone shot. (credits to Scapegoat for this)

Recieve a "Perfect!" score VS Kurona

The battle will begin with Kurona flying by and shooting bullets at you. Shoot them out of the air.
While nothing is flying at you, shoot Kurona.
Sometimes, the camera will look up and Kurona will fly towards you. You must shoot specific places on her to defend yourself.
Every few cycles, Kurona will throw out purple Mr Happy's (Mr Sadness?) which will turn into girls. You must fend off the girls in a similar way to which you'd deal with a possessed girl.

Kurona's weak spot is her waist/tail. Aim there to do critical damage.
If you feel confident, shoot the purple Mr Happy's out of the air before they can make a girl appear.
Take your time to ensure you do not miss too much.
Watch out for the flying punch, as there is not much time to hit the targets.
Play on beginner difficulty to make the attacks easier.
Buy the damage upgrades in the academy store to defeat her faster.


Supposedly, you can achieve this in Event mode, but it is much harder than story mode as you have the lowest level pheremone shot. (credits to Scapegoat for this)

Recieve a "Perfect!" score VS Patako

Patako's fight is a near mirror of Ekoro's Fight
See: Battle with the Bae: Ekoro


Supposedly, you can achieve this in Event mode, but it is much harder than story mode as you have the lowest level pheremone shot. (credits to Scapegoat for this)

These achievements are considered the hardest achievements in the game to achieve. These achievements require many playthroughs or great skill.

View all of the true endings

Complete Maya, Shinobu, Sisters, Ekoro, Kurona, Patako, and True Love's true endings.
See: _____ = Best Girl, I Love 'Em Both!, Girl of Your Dreams.

Complete Profiles for Every Girl

Get at least a silver medal on every girl's profile in the collection. There are multiple ways to do this as there are 3 ways to raise the medal level. You must also complete the ghost girl's ending as she does not appear in the collection until you do so.

This guide works wonders here. shameless plug
http://cs2bus.com/sharedfiles/filedetails/?id=843521210

For each girl, do at least two of the following

1. Complete the left side of the profile
This includes getting the handbook, gathering her measurements, and using doki-doki mode on her at least once. Once you've played through the game a few times, this is bound to happen without trying (Except maybe the measurements depending on how you play)

Handbooks can be found in levels throughout the game.
This guide tells you where every one can be found.

To gather measurements, zoom into a girl's body and stare at her bust, waist, or hips. A letter B,W, or H will appear alongside a bar. Keep staring until the bar fills and the data is recorded. Do this for all three measurements on every girl (Including teachers and the ghost girl)
To make this much easier, buy the Angel Measuring tape from the academy store.
To get some of the harder girls, such as Yanagida or Patako who hide far away, activate doki doki mode, but do not click on any girl. This will essentially freeze time and give you a chance to get the tricky girls' measurements.
You will know if you have all of a girl's measurements when her name appears yellow.

All of these can be collected in Score attack or story mode.
If you gather the handbooks and measurements for every girl, you will get silver if you choose to do #3 below.

2. Complete the girl's True Route
The main heroines will become gold through normal playthroughs, but each other girl can be individually raised one medal level by completing their ending in the true love route.

3. Collect all outfits
To collect a girl's outfits in the collection, you must use doki-doki mode on them while they are wearing that outfit. This is the hardest way to raise the medal level as it means you must use doki-doki mode on each girl twice (Once while in swimsuit, once while in gym clothes)
The best way to do this is score attack. If you notice you need more swimsuits, play more pool/changing room levels. If you find you need more gym clothes, play more track/tennis/gym levels. Each playthrough of a score attack level gives you around 2-4 usages. Make sure you use them on the right girls.

It is worth it to note that dressing room outfits DO NOT count. You must use it on the girl while she is in the correct environment. For example, if you were to change a girl's academy uniform to swimsuit, the doki-doki mode would not count for swimsuit, it would count for academy uniform. It is best to leave the dressing room as default in order to escape any confusion.
It is also worth noting that it will always be the same collection of girls in each stage. If the girl you need is not in the stage, try a different one. Quite often, you'll find more of a certain year of girls in the same stage.

Complete the ghost girl's ending in the true love route:
You must do this because the ghost does not appear in the collection until you get her ending.
To get her ending, do through the true love route and shoot her as much as possible. I believe you must shoot her 7 time in order to get her affection high enough. Refer to the aformentioned guide for ghost locations.


Tips:
Complete #1 for every girl. This is the easiest of the three options to complete and is often completed through normal gameplay (if you zoom in often, at least)
Considering you have completed the game and are turning to achievement guides, check your stats in the collection before grinding this achievement. I would recommend doing #1 and #3 for all girls of whom you already have one of their outfits collected. That way you can focus on doing the longer yet easier option (#2) for only girls of which you are far behind on.
Play through all score attack levels. This way you can find most if not all the handbooks before having to grind. you can also gather an idea as to which girls in which outfits are where so you know which levels to go back to when you grind this achievement.

Achieve a godlike rank

To get godlike rank, you must get over a million points in one playthrough.

Play on expert. There are more girls and therefore more points.
Use doki-doki mode liberally to ensure every girl is hit.
Finish levels quickly with high accuracy and without being hit to obtain bonuses.
Aim for as many Mr Happy's as possible.
Pop as many mini demons as possible.
Get perfect on as many battles as possible.
Do as many requests as possible to buy power upgrades.
Get a true ending to recieve a point bonus.
Save often in case you mess up one level so you can go back and retry.
git gud

Unlock all other achievements


Yes, I know this is technically a platinum achievement.

I hope this guide has served you guys well. If you happen to have any issues regarding the information I have provided (Unclear description, incorrect data, spelling errors) feel free to let me know in the comments!

Thanks to SirDarkon34_IF, jorgemalgorn, and Фельдмаршал Настойчивость - тян for their contributions. Make sure you like their guides!

Good day, and happy harem hunting!