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