Here is the full list of all 15 2Dark achievements.
You attacked one of the first enemies from behind and eliminated them.
You have taken over 10,000 steps in Gloomywood.
You remained concealed in the dark for more than two minutes.
You have found all the lists of the backers of 2Dark.
You finished a level without saving.
You finished the level without firing a single shot.
You finally fed that cat!
The circus lions took care of Antonio Petronelli for you.
You scored over 10 points playing pool.
You saved all the children in a level in one go!
You smoked too much, that’s bad!
A boss has been poisoned!
A boss was asphyxiated!
A boss was sliced up!
You found all the pink candies in the game.