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
Buy the Lighthouse.
Die once.
Exorcise the ghost 5 times.
Revive your friend with a Tarot Card.
Take Two Photos Of The Ghost.
Buy the Pub.
Successfully joined the "family."
Purchase Two Crucifix
Play on the Hospital map
Exorcise the ghost once.
Correctly identify the ghost 3 times.
Play on the Cyclone Street map.
Read EMF Level 5.
Correctly identify the ghost once.
Play on the Abandoned House map.