Here is the full list of all 50 room13 achievements.
Just Kill Something
Survive 2 Rounds in a Single Game
Survive 10 Rounds in a Single Game
Survive 15 Rounds in a Single Game
Survive 20 Rounds in a Single Game
Survive 25 Rounds in a Single Game
Survive 30 Rounds in a Single Game
Survive 35 Rounds in a Single Game
Survive 5 Rounds in your Career
Survive 10 Rounds in your Career
Use the Pellet Gun Reciever
Slaughter 150 of the Dead
Slaughter 750 of the Dead
Slaughter 3,000 of the Dead
Slaughter 6,000 of the Dead
Slaughter 10,000 of the Dead
Slaughter 25,000 of the Dead
Use the Machine Gun Barrel
Slaughter 500 of the Dead
Slaughter 1,300 of the Dead
Slaughter 2,250 of the Dead
Slaughter 5,500 of the Dead
Slaughter 14,000 of the Dead
Die 1,000 Deaths
Use the Starter Magazine
Slaughter 1,000 of the Dead
Slaughter 4,000 of the Dead
Slaughter 9,000 of the Dead
Slaughter 20,000 of the Dead
Use the Level 0 Stock
Slaughter 300 of the Dead
Slaughter 1,700 of the Dead
Slaughter 3,500 of the Dead
Slaughter 7,500 of the Dead
Slaughter 13,000 of the Dead
Slaughter 17,000 of the Dead
Slaughter 50,000 of the Dead
Slaughter 11,000 of the Dead
Slaughter 18,000 of the Dead
Slaughter 22,000 of the Dead
Survive 20 Rounds in your Career
Survive 30 Rounds in your Career
Survive 40 Rounds in your Career
Survive 50 Rounds in your Career
Survive 60 Rounds in your Career
Survive 70 Rounds in your Career
Survive 80 Rounds in your Career
Survive 90 Rounds in your Career
Survive 100 Rounds in your Career
Survive 110 Rounds in your Career