Here is the full list of all 24 CULTIC achievements.
The base game contains 23 achievements, and there is 1 DLC pack containing 1 achievements.
Win the rematch.
Clear Chapter One on Extreme
Find all secrets in Chapter One.
Spend $15,000 in the shop in a single Survival match
Clear a map without taking any damage
Discover my deepest shame
Defeat the Abomination
Rest on the throne.
Kill a Ghost with the prop they're currently holding
Reject an incoming TNT delivery
Kill 5 enemies with a thrown explosive barrel
Clog a toilet with body parts
Pop 250 enemy heads
Get 2 or more headshots with a single Lever Action shot
Fully upgrade a weapon
Headshot an enemy from 50 meters away with the pistol
Obliterate an enemy with the soap
Kill an enemy with an eyeball
Rescue a teddy bear from a map.
Deflect 25 thrown hatchets
Decapitate an enemy with a hatchet from over 20 meters away
Forget to throw the dynamite.
Kill an enemy with a chair from over 25 meters away