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