Upgrade all weapons in arcade mode
Upgrade all powerups in arcade mode
Purchase all perks in arcade mode
Kill 1000 enemies with machine gun in any single game mode
Kill 1000 enemies with the gatling gun in any single game mode
Kill 1000 enemies with the laser beam in any single game mode
Kill 1000 enemies with the rocket launcher in any single game mode
Kill 1000 enemies with the chain lightning gun in any single game mode
Survive 30 seconds without shooting on level 9 in HARD
Don't let the spider touch a scientist on level 10
Complete 5 rounds without dying
Don't use any powerup in level 6
Don't use any powerup in level 12
Don't use any powerup in level 18
Beat the target Combo for all levels on floor 02!
Beat the target Combo for all levels on floor 04!
Beat the target Combo for all levels on floor 05!
Collect 3 stars on every level of floor 2!
Collect 3 stars on every level of floor 4!
Collect 3 stars on every level of floor 5!
Dash into a frozen face hugger enemy on the ground
