Four Levels
Complete level 4 in Single Player mode.
20 ✓ August 7th, 2007
Team Players
Score 300,000 points in an Xbox Live CO-OP game, while still alive.
20 ✓ July 30th, 2007
Three Levels
Complete level 3 in Single Player or Multi-Player mode.
15 ✓ July 30th, 2007
Armory
Collect 5 different weapon types.
15 ✓ July 30th, 2007
Shot Down
Destroy the helicopter without dying once.
15 ✓ July 30th, 2007
Good Start
Complete level 1 in less than 3 minutes.
10 ✓ July 30th, 2007
Elite Soldiers
Both players possess a Spread Gun at the same time at some point in the game.
10 ✓ July 31st, 2007
Endurance
Both players must complete level 1 without losing lives in an Xbox Live CO-OP game.
10 ✓ July 30th, 2007
Two Levels
Complete level 2 while playing an Xbox Live CO-OP game.
10 ✓ July 30th, 2007
Good Score
Reach level 2 with a score of 100,000 or more.
10 ✓ July 30th, 2007
Master
Complete the game using only 1 credit.
35 
Five Levels
Complete level 5 in Single Player or Multi-Player mode.
30