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