Here is the full list of all 15 2Dark achievements worth 1,000 gamerscore.
You have taken over 10,000 steps in Gloomywood.
You have found all the lists of the backers of 2Dark.
You remained concealed in the dark for more than two minutes.
You finished a level without saving.
You finished the level without firing a single shot.
The circus lions took care of Antonio Petronelli for you.
You found all the pink candies in the whole game.
You finally fed that cat!
You scored over 10 points playing pool.
You attacked one of the first enemies from behind and eliminated them.
You saved all the children in a level in one go!
You smoked too much, it's bad!
A boss was poisoned!
A boss was asphyxiated!
A boss was cut into slices!