| Achievement | How to unlock
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| - Complete the single player campaign.
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| - Kill 500 zombies with the berserker buff.
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| - Kill at least 30 enemies after your teammates die in a single round.
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| - Be within blood splatter range for 3000 dismembering kills.
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| - Kill 50 zombies using the Electro-shield upgrade in a single game.
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| - Defend the objective 500 times.
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| - Accumulate 500 explosion kills.
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| - Heal 600 points of damage in a multiplayer game.
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| - Kill Sackhead using a chainsaw.
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| - Kill a tunneler using a well-placed mine.
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| - Hit 3 enemies with a single railgun shot.
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| - Heal 300 points of damage in a multiplayer game.
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| - Purchase all of the available upgrades in a single game.
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| - Be the first one to die in a multiplayer game.
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| - Have the maximum number of defense items built simultaneously.
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| - Lure 10 zombies onto a single mine.
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| - Spend 200 scrap metal repairing teammates' turrets in a multiplayer game.
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| - Kill 4 enemies in 3 seconds with the pistol.
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| - Do more damage than all of your teammates combined in a 3+ player game that lasts at least 4 rounds.
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| - Hit 5 enemies with a single railgun shot.
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| - Have 5 turrets up simulatenously.
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| - Kill 7 enemies using a single air support powerup.
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| - Survive a night without using your flashlight while still killing at least 10 enemies.
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| - Stop Sackhead with a bear trap.
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| - Last 6 rounds without building any turrets or fences.
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| - Kill a teammate with the afterblast of a demolition zombie that you shot.
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| - Kill Deadmass using the med gun.
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| - Kill all enemies in the Sewer on normal.
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| - Go 4 rounds without taking any damage and kill at least 40 zombies within that time.
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| - Heal 600 points of damage and kill 25 zombies with the rocket launcher in a multiplayer game.
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| - Complete the single player campaign on normal without dying.
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| - Take at least 500 points of damage in a single life.
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- The Little Zombie That Could
| - Get killed by the last basic zombie of the round.
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| - Take at least 250 points of damage in a single life.
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| - Catch 500 enemies using the bear trap.
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| - Hit 10 enemies with a single railgun shot.
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| - Complete the single player campaign on normal without taking damage.
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| - Heal 300 points of damage using lifesteal in a single game.
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| - Kill 6 enemies with the flamethrower within 8 seconds.
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