Contra cheats and cheat codes for Xbox 360

Achievements:
Complete the following achievements to award the indicated amount of 
Xbox Live Gamerscore points. 

Well Equipped (15 gamerscore points): 
Pick up three kind of weapons in the second tunnel.

Untouchable (10 gamerscore points): 
Get to the first tunnel without losing a life.

Tunnel runner 2 (15 gamerscore points): 
Clear the second timed tunnel with 55 seconds or more left.

Tunnel runner 1 (10 gamerscore points): 
Clear the first timed tunnel with 33 seconds or more left.

Tough Guy (20 gamerscore points): 
Get to the second tunnel without obtaining a single weapon upgrade.

Team Work (10 gamerscore points): 
Score 100,000 points in an Xbox Live Co-op game.

Proficient (20 gamerscore points): 
Finish the second tunnel and reach at least 100,000 points in Arcade mode.

Partnership (20 gamerscore points): 
Finish the game in Xbox Live Co-op mode.

Infiltration (15 gamerscore points): 
Blow up the alien tower at the end of the water level.

Full Assault (30 gamerscore points): 
Finish the game less tahn 12 minutes.

Bulletproof (25 gamerscore points): 
Finish the game in Arcade mode using only 1 credit.

Armory (10 gamerscore points): 
Collect gout different weapon power-ups.