Kill a total of 1000 enemies.
Kill a total of 10,000 enemies.
Survive 8 waves in Final Stand mode (Hard difficulty).
Survive 16 waves in Final Stand mode (Hard difficulty).
Reach the exit in Escape mode (Hard difficulty).
Find 5 secret areas in a single Story run.
Survive 8 waves in Final Stand mode (Brutal difficulty).
Reach the exit in Escape mode (Brutal difficulty).
Kill 25 enemies in a single run using explosive barrels.
Defeat a boss in Story mode (Hard difficulty).
Defeat the final boss in Story mode (Brutal difficulty).
Finish Chapter 1 in Story mode.
Finish Chapter 2 in Story mode.
Finish Chapter 3 in Story mode.
Kill 25 enemies in a single run using turrets.
Kill 5 enemies within 1 second.
Kill 10 enemies within 1 second.
Unlock all Psionic abilities for a character.
Upgrade a single Psionic ability to Level 3.
Fully upgrade any of your weapons.