Here is the full list of all 19 Demonologist achievements.
Play on the Kurosawa House map
Exorcise the ghost in the Bedlam
Play on the Bedlam map
Revive your friend with a Tarot Card.
Successfully joined the "family."
Buy the Lighthouse.
Play on the Hospital map
Buy the Pub.
Exorcise the ghost 5 times.
Purchase Two Crucifix
Take Two Photos Of The Ghost.
Play on the Cyclone Street map.
Correctly identify the ghost 3 times.
Exorcise the ghost once.
Read EMF Level 5.
Die once.
Correctly identify the ghost once.
Play on the Abandoned House map.