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