Full list of all 27 Layers of Fear achievements. It takes around 12-15 hours to unlock all of the achievements in the base game on Windows.
The base game contains 18 achievements, and there is 1 DLC pack containing 9 achievements.
Completed a painting
Searched 100 drawers and cabinets
Embraced death for the first time
Collected a rat sketch
Discovered an echo from the past
Took a thousand steps
Found a memento of your family
Got working on your Magnum Opus
Gathered all drawings of rodents
Recalled every word you said
Gathered all family mementos
Made up your mind
Gazed at paintings for a total of an hour
Recalled all your childhood memories.
Assemble all the puzzle pieces.
Read every note in the game.