Cooperation (10) - Score of 15,000 in an Xbox Live CO-OP game.
Mutant (10) - Shoot five mutants in one game.
One Wave (10) - Make it to the 2nd wave without losing any humans.
Competitive (15) - Win 30 Xbox Live versus games.
Fifteen Grand (15) - Obtain a personal score of 15,000.
Getting Better (15) Â– Survive until the 3rd wave.
Nice Catch (15) - Rescue a human with a mid-air catch.
Run! (20) - Survive the first 75 seconds without shooting, bombing, or teleporting.
Baiter Bane (20) - During an Xbox Live Co-op game, kill five baiters in any level without using smart bombs.
Five Waves (20) - Make it to the 5th wave.
Protect All Humans (25) - Lose zero humans in the first three waves.
Twenty-Five Grand (25) - Obtain a personal score of 25,000.
GamesRadar is the premiere source for everything that matters in the world of video games. Casual or core, console or handheld - whatever systems you own or whatever genres you love, GamesRadar is there to filter out what's worth your time and to help you get even more from your games. We deliver the best advice, the most in-depth features, expert reviews, and the essential guides for all the top games.