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