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