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