Here is the full list of all 43 Over 9000 Zombies! achievements.
Kill 900,000+ Zombies!
Construct 1000 Turrets from random scraps of metal!
Get 30 kills per second!
Kill 90,000+ Zombies!
Derail the Waltz of the Undead!
Vote for Zombie Thomas Jefferson, or don't.
The army of the undead will march at daybreak!
Voted the greatest zombie of all time!
Get 15,000 damage per second!
Construct 100 automated turrets.
No 8th symphony for zombie Sibelius!
Zombie Napoleon meets his zombie Waterloo!
Collect 100 Power Ups!
Kill over 1000 crabs!
Kill over 1000 zombie eyes!
Kill 9,000+ Zombies!
Kill over 1000 zombie crows!
Kill over 1000 zombie dogs!
The zombie world is independent of our will.
Abused patience turns to fury!
Health is the greatest gift, a close second is BRAINS!
Terror possessed me then!
If only he had the body of a horse...
A jail is an isolated system.
Blood and Flesh can be trusted.
Decreased Zombotropy.
Quoth the Raven "Nevermore."
Don't call me slow!
Your world didn't end!
You didn't donate your organs...
It didn't taste like chocolate ice cream either...
Not a wimp.
Lots of progress!
You watched the world burn, and survived. It was kind of cool.
Get 5,000 damage per second!
Participate in a multiplayer game.
Kill 1000+ Zombies!
Green IS good.
Construct a turret from scrap metal!
You won that race.
Making some progress...
The first day is always the hardest, except in this case, it's the easiest.
Get 10 kills per second!