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