Here is the full list of all 15 DreadOut 2 achievements.
Complete Ghostpedia Entries
Complete "The Bloody Love Story"
Complete Mona's Urban Legends
Backstab (?) Ghosts
Finish Act 6
Visit All Locations
Finish Act 5
Finish Act 4
Talk to All Ghost NPCs
Stun (?) Ghosts
Finish Act 3
Complete "Ghost Rider"
Finish Act 2
Finish Act 1
Finish Act 0