No missable achievements (plus 44 unknown)
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Kill 4 enemies in 3 seconds with the pistol
Hit 3 enemies with a single railgun shot
Die while reloading
Be the first one to die in a multiplayer game.
Kill 6 enemies with the flamethrower within 8 seconds.
Take at least 250 points of damage in a single life.
Kill a teammate with the afterblast of a demolition zombie that you shot.
Stop Sackhead with a bear trap
Survive a night without using your flashlight while still killing at least 10 enemies.
Take at least 500 points of damage in a single life.
Hit 5 enemies with a single railgun shot
Kill all enemies in the Sewer on normal.
Complete the single player campaign.
Last 6 rounds without building any turrets or fences
Kill at least 30 enemies after your teammates die in a single round.
Heal 300 points of damage in a multiplayer game.
Have 5 turrets up simulatenously.
Kill 7 enemies using a single air support powerup
Purchase all of the available upgrades in a single game
Kill Deadmass using the med gun
Heal 300 points of damage using lifesteal in a single game
Heal 600 points of damage in a multiplayer game.
Do more damage than all of your teammates combined in a 3+ player game that lasts at least 4 rounds.
Kill 3,000 enemies
Get killed by the last basic zombie of the round.
Kill a tunneler using a well-placed mine
Accumulate 500 explosion kills
Kill Sackhead using a chainsaw
Kill 6,500 enemies
Lure 10 zombies onto a single mine
Complete the single player campaign on normal without dying.
Hit 10 enemies with a single railgun shot
Have the maximum number of defense items built simultaneously.
Kill 50 zombies using the Electro-shield upgrade in a single game.
Spend 200 scrap metal repairing teammates' turrets in a multiplayer game.
Build 500 structures
Kill 20,000 enemies
Kill 500 zombies with the berserker buff
Defend the objective 500 times
Catch 500 enemies using the bear trap
Go 4 rounds without taking any damage and kill at least 40 zombies within that time.
Be within blood splatter range for 3000 dismembering kills
Heal 600 points of damage and kill 25 zombies with the rocket launcher in a multiplayer game.
Complete the single player campaign on normal without taking damage.