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