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