Here is the full list of all 22 Looters achievements.
The base game contains 9 achievements, and there is 1 DLC pack containing 13 achievements.
Save your friend for the first time.
Complete the first heist in the Greenhouse.
Solve the sheep puzzle in the Greenhouse.
Get an S rank in the Hall.
Get an S rank in the Kitchen.
Get an S rank in the Library.
Get an S rank in the Greenhouse.
Complete a level without being attacked even once by a Cultist.
Throw an item into the Bag from very far away.