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