Collect 5 different weapon types.
Select the "Arcade Game" option at the main menu. Then, press Up(2), Down(2), Left, Right, Left, Right, B, A to get unlimited lives and an unlimited Super Machinegun. Note: Enabling this code prevents achievements from being earned and uploading of scores to Xbox Live Leaderboards. To disable the code, exit the game using the "Exit Game" option in the pause menu.
Both players possess a Spread Gun at the same time at some point in the game.
Both players must complete level 1 without losing lives in an Xbox Live CO-OP game.
Complete level 5 in Single Player or Multi-Player mode.
Complete level 4 in Single Player mode.
Reach level 2 with a score of 100,000 or more.
Complete level 1 in less than 3 minutes.
Complete the game using only 1 credit.
Destroy the helicopter without dying once.
Score 300,000 points in an Xbox Live CO-OP game, while still alive.
Complete level 3 in Single Player or Multi-Player mode.
Complete level 2 while playing an Xbox Live CO-OP game.
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