Here is the full list of all 34 Zombie Night Terror achievements.
Scare 6 humans with a single scream
Kill 50 cops
Paint over 9,000 blocks with blood
Blast through 256 breakable blocks
Kill Gronald
Let 1,000 zombies die
Fall with style for at least 10 seconds with a zombie
Collect 100 Mutation Barrels
Defeat the Boss in Chapter 1
Collect 1,000 DNA units
Let 66 zombies fall to their death
Kill a zombie by making him jump from too high
Prevent a zombie from falling to its death by blowing up another zombie
Kill a zombie by blowing up another zombie nearby
Destroy 28 doors
Use 5 contaminations on humans
Bite 10 humans to death in 15 seconds
Kill 10,000 humans
Defeat the Boss in Chapter 2
Defeat the Boss in Chapter 3
Defeat the Boss in Chapter 4
Bite 1,337 humans to death
Lose a level by sacrificing your last zombie
Blow up 4 humans with a single explosion
Assemble a horde of 12 zombies with a screaming Overlord
Spend 104 minutes on the Credits page
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