Here is the full list of all 21 Occult achievements.
defeat the evil
big bang
died from the fall
kill with train
collected 10 jewelry
kill mediums
mirror quest finished
throw a friend out of the cupboard 5 times
killed the Spiderlady
start a four-player game
open 3 locked doors
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
caught 25 spiders
complete the game alone
start a game together
found the phone and answered the call
25 window jumps
5 minutes to stand by the car