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