August 2023 Update: The secrets for the mission pack remains untouched by the remaster. Thus this guide can be used either for a classic or a remastered run of its campaign.
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Following the same structure set by the original, The Reckoning's singleplayer mode consists of five units of varying length and features a total of 65 secrets. This guide has been created to serve as a clean-cut visual aid for new and returning players alike aiming for getting all of them.
As with all classic shooters, discovering the secrets by one's self is a huge part of the fun so it is recommended that you only refer to the guide to find out what you are missing instead of following it step by step. Though not marked as secrets, there are also many more items to be found in explosive crates or hard to reach spots so a thorough search of any given level is almost always rewarding.
The guide is laid out so that the numbering of the secrets is in line with the mostly linear flow of the game: where multiple paths are available, it is presumed that the player goes towards the objective first. In addition, due to the unit-based nature of the title, a few of the secrets are only accessible upon returning to the same level at a later stage. In those cases, a later visit to the level in question can be identified by the tag (Continued) besides its name.
Of the two shots provided for the secrets, the first one covers the area it is to be found in while the second one shows a particular detail, which, in most cases, is the trigger itself. Additional tips are deliberately kept short to let the shots speak for themselves.

Intended for classic players, as the remaster offers menu-based unit selection.
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Although not offered through the in-game menu, it is possible to start playing directly from a later unit with a loadout as seen fit by the developers. This can be done by using the following commands (given in italics):
Military Compound / exec xcompnd.cfg
Industrial Region / map industry, then exec industry.cfg *
Spaceport / exec xhangar.cfg
Moon Base / exec xmoon.cfg
(* The map command is needed beforehand for Unit 2, as the command to launch it in the following .cfg file has a double slash in front of it, thus the engine leaves it out as a comment rather than executing it - this must be an oversight on developers' part.)
Note that the game defaults to Medium difficulty unless it is changed by using the skill variable. To start playing on another difficulty, be sure to type in the appropriate command (given in italics) from the list below before executing the command for the unit.
Easy / skill 0
Medium / skill 1
Hard / skill 2
Nightmare / skill 3
In Quake series of games, difficulty levels differ in the monster count and the amount of damage taken by the player, so Hard difficulty is recommended for the most complete experience. Nightmare (also known as Hard+, as displayed in the status / objectives subscreen) difficulty, which was originally hidden and is otherwise the same as Hard difficulty, remains a matter of preference as it requires a different approach to the gameplay due to its highly reducing the pain states of the monsters as well as its making them quicker on the trigger.
It is already pretty well-known that the game, as in most of the classic shooters, allows loading of the levels directly by typing in their filenames alongside the map command. Still, since doing so does not grant the player any type of equipment (other than Blaster) nor any key items which may be required for progression, the filenames for the levels are purposely left out of this guide.

This unit consists of 3 levels that contain a total of 10 secrets.
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THE SWAMPS
1/3 - Dive into the water, make your way around and jump across the gap.
2/3 - Climb onto the rocks by the sewer entrance and check the pool in the cave.
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SEWERS
1/3 - Shoot the cracked part of the wall in the corner right before the slime tank.
2/3 - Shoot the grate in the water by the laser security grid.
3/3 - Dive into water and check underneath the security bridge after raising it.
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WASTE SIEVE
1/4 - Shoot the above button as you pass the tumbler to open up a compartment ahead.
2/4 - After getting out of the pool, turn around and shoot the Strogg symbol.
3/4 - Make your way to the top of the pipe room and check the dark corner.
4/4 - Drop down from the control room's windowsill onto the pipes below to reach the item.
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THE SWAMPS (Continued)
3/3 - Use the explosive barrel to reach the newly-opened alcove after extending the bridge.

This unit consists of 5 levels that contain a total of 15 secrets.
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OUTER COMPOUND
1/4 - Shoot the explosive barrels and push the panel behind them that slightly juts out.
2/4 - Shoot the damaged ceiling and climb onto the crates to reach the second floor.
3/4 - Shoot the button and drop down to the lower floor to reach the newly-accessible area.
4/4 - Shoot the button and get to the other side of the slope before it rises.
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INNER COMPOUND
1/5 - Climb onto the crates and push the button located on top of the computer.
(Needs to be done before activating the laser in the same room.)
2/5 - Drop down to the floor underneath the laser to access a hidden compartment.
3/5 - Jump and touch the blinking light fixture to open up another hidden compartment.
4/5 - Climb onto the rocks next to the bridge and make your way to the top.
5/5 - Dive into the water and look for a hidden cave.
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CORE REACTOR
1/3 - Crawl under the stairs in the machinery room to find a hidden item.
2/3 - Get on top of the pipe, go right and drop down onto the crate to reach the item.
3/3 - Get on top of the pipe, go left and drop down onto another crate to reach the item.
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THE WAREHOUSE
1/2 - Disable the force fields, shoot the button and drop down on top of the elevator.
2/2 - Jump in the shaft while the fan is still active to reach the ledge above.
(Needs to be done before blowing up the conduit in the same shaft.)
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INTELLIGENCE CENTER
1/1 - Download the data, climb the ladder to get the suit and dive into the acid below.

This unit consists of 5 levels that contain a total of 22 secrets.
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INDUSTRIAL FACILITY
1/5 - Jump onto the ledge and leap from block to block till the very end.
2/5 - Shoot the explosive crate then the button behind it to open up a hidden compartment.
3/5 - Shoot the same button once more while keeping inside the said compartment.
4/5 - Shoot the part of the grating above the light fixture on the duct to reveal a hidden item.
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OUTER BASE
1/3 - Shoot the button inside the vent to open up a hidden alcove ahead.
2/3 - Shoot the larger grate in the corner to access a hidden area.
3/3 - Take the elevator up, send it back down and drop down on top of it to find a hidden item.
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Easter Egg
An invulnerability power-up can be seen just by the tip of it on the upper ledges of Industrial Facility, right next to the Refinery entrance. Rocket jump towards it to receive a message from the developers. -- ChrisLP adds that it can be picked up if approached above from the pillar side, by doing another rocket jump that takes you over the trigger.
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REFINERY
1/3 - Shoot the explosive crate, push the newly-revealed button, take the suit and dive into the acid to find a hidden item.
2/3 - Take the suit near the marker receptacle, return to the previous area, dive into the acid and surface under the bridge.
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INDUSTRIAL FACILITY (Continued)
5/5 - Use the blue-coloured light fixture as a step and get on top of the crates to reach the item.
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WATER TREATMENT PLANT
1/7 - Use the semi-hidden steps that jut out from the rock to reach the top of the structure.
2/7 - Shoot the explosive crate first then make it to the item in sight by way of the others.
3/7 - Still in the same room, blow up the semi-hidden conduit and make your way to the ladder that comes down by jumping from crate to crate to reach a hidden area.
4/7 - Dive into the canal and check the narrow opening next to the floodgate.
5/7 - Dive into the canal in the following area, shoot the cracked grate and get into the pipe.
6/7 - In the area reached via swimming through the said pipe, dive back into the water but get into the other pipe this time to find one more hidden item.
7/7 - Shoot the grate at the end of the canal to find another hidden item.
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BADLANDS
1/4 - Check the sides of the hatch opening to find a grill, shoot both that and the button behind it then drop down back into the hatch to find a newly-accessible compartment.
2/4 - At the upper cliffs overlooking the hatch, work your way up to the ledge on the left.
3/4 - Still at the cliffs, this time work your way up to the ledge on the right.
4/4 - Work your way up to ledge next to the exit via the rocky steps and jump on top of the structure to get the item.
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REFINERY (Continued)
3/3 - Get on top of the pipes and shoot the cracked one in the middle to reveal a hidden item.

This unit consists of 3 levels that contain a total of 11 secrets.
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LOWER HANGARS
1/5 - Look around the crates in the corner of the storage area to find a semi-hidden item.
2/5 - Following the other path, shoot the wall with a writing on it to access a hidden area.
3/5 - Look for a striped panel after getting off the elevator and shoot it to reveal a hidden item.
4/5 - Shoot the explosive crate and the button behind it to open up a hidden compartment.
5/5 - Take the opening between the crates and shoot the explosive one under the stairs.
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THE HANGARS
1/3 - Jump on top of the red-coloured crate to find a hidden item around the corner.
2/3 - Check underneath the ramp that leads to the freighter to find another hidden item.
3/3 - Shoot the striped panel while crawling through the maintenance hatch.
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STROGG FREIGHTER
1/3 - Jump onto the crate right across the starting point and crawl in to reach a hidden item.
2/3 - Shoot the Strogg symbol at the back of the computers to reveal a hidden compartment.
3/3 - Shoot the button in the alcove to open up another hidden compartment.

This unit consists of 2 levels that contain a total of 7 secrets.
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CARGO BAY
1/5 - Get on top of the crates stacked in the corner and drop down into the opening.
2/5 - Get on top of the rafters, make your way to the end and shoot the Strogg symbol.
3/5 - Check behind the crates stacked at the back of the balcony overlooking the entrance.
4/5 - On the second floor ledge, shoot the wall with a writing on it to reveal hidden items.
5/5 - Shoot both buttons located way above in the circular room to reveal a hidden area.
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COMMAND CENTER
1/2 - Shoot the button above the reactor by the entrance to reveal a hidden compartment.
2/2 - Shoot the ice covering the puddle of water inside the cave to reach the item within.

Intended for classic players, as the remaster is already a fully fledged source port in itself.
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All the screenshots within the guide are taken under the Yamagi client (build 7.45). It is a carefully maintained alternate executable that offers modern OS compatibility, a newer OpenGL renderer featuring enhanced visuals with external texture and proper widescreen support, a much better sound driver with surround capabilities and ogg playback, a reworked and more reliable save system and a scalable HUD alongside hundreds of code fixes and a bunch of subtle quality of life improvements. It is thoroughly recommended for a bug-free, hassle-free vanilla experience. Check it out here.[www.yamagi.org]
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Guides for the original game, Ground Zero and Zaero following the same format seen here are also available to accompany this one. Check them out if you are in for a completionist's run: