Here is the full list of all 38 Die Already achievements.
The enemy killed in the blast
Take Laser Riffle
200 Kills
Take Bazooka
150 Kills
Take Minigun
Killed zombies
Destroyed the turret
Take Shotgun
Took greater the first-aid kit
Found the secret
Broke the wall
The beginning of level 4
Broken door
Killed 1 boss
The player died
50 Kills
Take Assault Riffle
Used morphine
Blew up the barrel
The beginning of level 3
Take MAC10
Took the second gun
Used the jerk
Used accelerator
Met a friend
Used the drone
You kill 1-st enemy
You start game
250 Kills
400 Kills
500 Kills
Activated teleport
Take Desert Eagle
Take Railgun
Used Shield
Used Quad
The beginning of level 8