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.
Buy the Pub.
Purchase Two Crucifix
Take Two Photos Of The Ghost.
Read EMF Level 5.
Exorcise the ghost 5 times.
Play on the Hospital map
Die once.
Play on the Cyclone Street map.
Correctly identify the ghost 3 times.
Exorcise the ghost once.
Correctly identify the ghost once.
Play on the Abandoned House map.