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