Here is the full list of all 7 Amnesia: A Machine for Pigs achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Emerged on to the streets in Amnesia: A Machine for Pigs.
Performed an act of self-butchery in Amnesia: A Machine for Pigs.
Entered the bilge in Amnesia: A Machine for Pigs.
Entered the factory in Amnesia: A Machine for Pigs.
Entered the cellars in Amnesia: A Machine for Pigs.
Read all notes in the game.
Achieved all other achievements.