Here is the full list of all 23 The WereCleaner achievements.
5-Star a level
All levels 5-Starred
Kill your first coworker
Get the "No-Kills" sticker on all levels
Knap a coworker
Beat the game
Get a collectable
Get all collectables
Get killed by Daryl
Kill 5 coworkers in one level
Get a coworker to pick up a trash ball
Kill a coworker who's seen your mess
Have 5 coworkers knapped at the same time
Time out on Level 1
Make one coworker throw away four trash balls within the same level
Make a coworker see a dead body in Level 2
Knap every coworker in Level 3
Kill every coworker in Level 6
Completely skip the dialogue in a level. You made our narrative lead very sad.
Finish Level 4 without making a single coworker curious
Powerwash the CEO while he’s asleep in his office
Play the arcade machine during Level 5
Steal a trash ball from a coworker