Here is the full list of all 19 Demonologist achievements.
Exorcise the ghost in the Bedlam
Play on the Bedlam map
Play on the Kurosawa House 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.
Purchase Two Crucifix
Exorcise the ghost once.
Play on the Cyclone Street map.
Read EMF Level 5.
Correctly identify the ghost 3 times.
Correctly identify the ghost once.
Die once.
Play on the Abandoned House map.