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