The reason I recommend getting this achievement last is due to natural accumulation of the wanted posters you get during the main gameplay loop. This will reduce the total amount of posters you'd have to get by grinding. For example, I had 21/32 wanted posters collected after the main game.

The next step is to ensure that you're playing on the version 2.0.4. or above. This specific version includes a patch made by the developer that forces a wanted doppelganger of the resident in the waiting list to appear each day of the Campaign Mode.

The last step for increaing the odds is to love thy neighbors... by calling the D.D.D. on them...
It does sound inhumane, but by removing the residents, whose wanted posters we've already collected, we would be able to increase our overall chances for the favorable outcome by lowering the total pool of residents inside the building. This would make the desired neighbor more likely to appear in the waiting list on the following day.

1) Play on the version 2.0.4. or above.
2) Play the Campaign Mode.
3) Kill specific neighbors, who we do not want to see ever again, to reduce the total probability pool.

1) Start a new game of the Campaign Mode and immediately check the waiting list. The first day only has three visitors, so if one these people is the neighbor whose doppleganger poster you want to get, continue playing. Otherwise, keep going to the main menu and restarting the Campaign Mode from day one until you get the required neighbor.

2) Do not check the documents of the people whose wanted posters you've already collected, that would waste time. Just press the red button whenever they enter to get eliminated by the D.D.D. Doing so would increase our chances by lowering the total probability pool.

The only reason not to press the red button is to let obvious dopplegangers in, so they could kill all neighbors in a specific apartment. If you don't need Robertsky and Albertsky, for example, you can let a doppelganger in so he could eliminate two people from the pool. Doing so is very efficient and useful for future days, allowing you to kill people remotely. (Thanks to klubbu for suggesting this idea.)

3) If you do not have the needed resident in the waiting list on the following day, do not be afraid to reload the level. However, instead of straight up creating a new game, do that by pressing "Continue the campaign" to keep the eliminated neighbors flagged as eliminated and so the game couldn't place them on the waiting list.

4) Continue playing and finishing the days until day 5. Day 5 is the final one, so ending it would reset your progress and repopulate the apartment complex with 20 neighbors again, we don't want that, so immediately go to the main menu as soon as you see the window gate close. And yet again, since this is the final day of the campaign, just call D.D.D. on everyone, there's no need to check the paperwork.

5) Keep grinding and repeating this process until you get all the posters. (Took me about 5 hours to go from 21 to 32.)

Example: If during the first day, the waiting lists shows Gloria, Nacha and Izaack, the game will choose a random resident from said list.



Let's say the game chose Izaack, then it will decide on his doppelganger from one of the wanted posters, he only has 2 of them: skull with the melted face or the one with 2 noses and no eyes. Let's assume the game chose the skull one and we've never seen this doppelganger before; when he comes to the window, we will get our wanted poster:



Let's say that the fake Izaack with the melted face came earlier than the real one. If you haven't collected the poster with double noses, keep Izaack alive. Otherwise, you can kill Izaack after getting the final of two posters.

Let's also assume that we have seen Gloria and Nacha's dopplegangers, so we'd have to call D.D.D. on them to kill them for better future probabilities. You can also let some doppelgangers in to make them kill all the neighbors residing in a specific apartment, further lowering the overall pool of people. Continue and finish the day.

We would then repeat this process by going back to the main menu and choosing the option "Continue the Campaign Mode" instead of the "New" one. If you do this, your progress will be saved but the list will still be rerolled. Keep reloading the level and repeating these steps until you unlock all the posters. On day 5 you can deny everyone since it is the last day, but also do not let the day to end so you could load the game with fewer neighbors for better chances.

However, not everything counts towards the wanted posters progress. For example, doppelgangers with these features DO NOT contribute to this achievement:
- Third eye.
- Googly eyes with bags underneath.
- Trypophobia holes.
- Small arms growing on the face/neck.
- Small mouth on the cheek. (Except for Elenois)*
- Disfigured, veiny head with a lot of bumps.
- Inconsistent size, shape or location of facial features, or facial features belonging to other people.
- Invalid documents.


Unique doppelgangers are the ones tied to a specifc resident and who typically do not share their appearance with common doppels.** For example, only Steven's doppelganger can have a sticky note on his face, doppelgangers of other people cannot have such feature.

* (For some reason, Elenois' doppelganger with the mouth on the cheek is considered unique despite the fact that this feature can appear on doppelgangers of other residents.)
** (While Francis and Rafttellyn share the Hoon doppelganger, each of them has a unique appearance.)

Based on this information, it should be easy to determine which unique doppelgangers we have yet to encounter. And since the posters are placed seemingly randomly in the in-game menu, I made a detailed and structured table of the wanted doppelgangers for each resident:

I hope my guide could be helpful in your quest of obtaining the Bounty Hunter achievement.
This is the first Steam guide I've ever written, so the overal feedback is highly appreciated. Thank you for reading! Have a nice day!