Here is the full list of all 21 Occult achievements.
kill mediums
died from the fall
25 window jumps
defeat the evil
collected 10 jewelry
sat in the closet for more than a minute
open lockers and drawers 50 times
first time stunned by a monster
helped a friend get up
found the phone and answered the call
caught 25 spiders
mirror quest finished
killed the Spiderlady
complete the game alone
start a four-player game
start a game together
throw a friend out of the cupboard 5 times
5 minutes to stand by the car
open 3 locked doors
big bang
kill with train