Here is the full list of all 27 A Step From Insanity achievements.
Play for 1 hour (in-game)
Play for 10 hours (in-game)
Play for 100 hours (in-game)
Kill 100 total enemies
Kill 20 doctors
Kill 100 doctors
Kill 500 doctors
Kill 20 gangsters
Kill 100 gangsters
Kill 20 hallucinations
Kill 100 hallucinations
Find the slimey guy aww :D
Finish the game without equipping a torch
Finish the game without using any consumable item
find the banan man, being blessed eternally at the same time
Obtain the first powder, a key ingredient in your quest from insanity
Triumph over the Mental Institution's CEO
Put an end to the deranged City Chief
Kill 20 flying fish
Kill 50 flying fish
Kill 200 flying fish
Carry your trusty map to the end of the game
click the guy the thing yea