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