Lucky Zombie

"You have a one in a million chance of getting this achievement for every zombie you kill."

Difficulty: Luck

Strategy
Survival: Pool (Endless) and Last Stand: Pool (Endless) give out huge amounts of zombies. Get a good strategy and kill as many zombies as you can!

Trivia

 * You are automatically rewarded this achievement when you kill your 100th Yeti Zombie, but it will have a different description:
 * "Kill off 100 Yeti zombies. You lucky little..."