Contra Codes -

30 Lives
Enter , , , , , , , , , at the title screen to get 30 lives.

Achievements
Armory - Collect 4 different weapon power-ups.
Team Work - Score 100,000 points in an Xbox Live Co-op game.
Untouchable - Get to the first tunnel without losing a life.
Tunnel runner 1 - Beat the first timed tunnel with 33 seconds or more left.
Infiltration - Destroy the alien tower at the end of the water level.
Tunnel runner 2 - Beat the second timed tunnel with 55 seconds or more left.
Well Equipped - Collect 3 different weapons in the second tunnel.
Tough Guy - Get to the second tunnel without obtaining a single weapon upgrade.
Proficient - Complete the second tunnel with a score of 100,000 or more in Arcade mode.
Partnership - Complete the game in Xbox Live Co-op mode.
Bulletproof - Complete the game in Arcade mode using only 1 credit.
Full Assault - Complete the game in under 12 minutes.