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