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