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
Pop 250 enemy heads
Fully upgrade a weapon
Get 2 or more headshots with a single Lever Action shot
Rest on the throne.
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
Kill an enemy with an eyeball
Discover my deepest shame
Forget to throw the dynamite.
Deflect 25 thrown hatchets
Obliterate an enemy with the soap
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.