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