Kill 100 creeps.
Overheat your weapon.
Lose your first game.
Use a pickup.
Earn 10,000 score in total.
Earn 100,000 score in total.
Earn 500,000 score in total.
Earn 1,000,000 score in total.
Earn 10,000,000 score in total.
Spend 10,000 credits in total.
Spend 50,000 credits in total.
Spend 100,000 credits in total.
Spend 1,000,000 credits in total.
Use 1,000 pickups.
Overheat your weapon 500 times.
Take 1,000 health damage in total.
Take 10,000 health damage in total.
Take 1,000 damage from friendly fire.
Take 10,000 damage from friendly fire.
Deal 1,000 friendly fire damage.
Deal 10,000 friendly fire damage.
Kill 1,000 creeps with the Sidearm.
Kill 1,000 creeps with the Submachine Gun.
Kill 1,000 creeps with the Pump-Action Shotgun.
Kill 1,000 creeps with the Sniper Rifle.
Kill 1,000 creeps with the Flamethrower.
Kill 1,000 creeps with the Rocket Launcher.
Kill a boss monster.
Kill 10 boss monsters.
Reach 20,000 score in a 1-player game.
Reach 50,000 score in a 1-player game.
Reach 100,000 score in a 1-player game.
Reach 20,000 score in a 2-player game.
Reach 50,000 score in a 2-player game.
Reach 100,000 score in a 2-player game.
Reach 20,000 score in a 3-player game.
Reach 50,000 score in a 3-player game.
Reach 100,000 score in a 3-player game.
Reach 20,000 score in a 4-player game.
Reach 50,000 score in a 4-player game.
Reach 100,000 score in a 4-player game.