How do you get the achievement for "undead space"? How do you pile up the zombies?
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To get the undead space achievment you need to kill a total of 10,000 zombies. When you have killed 10,000 zombies go to the leaderboards and you will see a trash can filled with zombies. Scroll to the top and you will see the number of zombies you have killed and it will give you the achievment.
Just keep on killing zombies, after you've killed 10,000 zombies go to leader boards and scroll to the top
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