Here is the full list of all 34 Zombie Night Terror achievements.
Kill 10,000 humans
Start the level editor
Bite 1,337 humans to death
Paint over 9,000 blocks with blood
Kill 50 cops
Successfully complete all levels
Defeat the Boss in Chapter 4
Defeat the Boss in Chapter 3
Let a Tank get squashed
Lose a level by sacrificing your last zombie
Blast through 256 breakable blocks
Collect 100 Mutation Barrels
Kill 7 enemies with a single Tank dash
Let 1,000 zombies die
Defeat the Boss in Chapter 2
Let 66 zombies fall to their death
Blow up 4 humans with a single explosion
Assemble a horde of 12 zombies with a screaming Overlord
Scare 6 humans with a single scream
Collect 1,000 DNA units
Kill Gronald
Defeat the Boss in Chapter 1
Fall with style for at least 10 seconds with a zombie
Kill a zombie by making him jump from too high
Kill a zombie by blowing up another zombie nearby
Prevent a zombie from falling to its death by blowing up another zombie
Destroy 28 doors
Use 5 contaminations on humans
Bite 10 humans to death in 15 seconds
Spend 104 minutes on the Credits page
Be patient!
¯\_(ツ)_/¯
Successfully complete all challenges
Create a level and upload it to Steam Workshop