Super Contra Cheats - Xbox 360

Cheat Mode
Highlight "Arcade Game" and press [A]. The next screen will have two options "Begin Game" or "Exit". At this screen, press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [B], [A], [B], [A]. The game will begin when you press the last [A]. Your lives will display as "4", but you will have 30, and your gun will always be the missiles in rapid fire mode. Note: You cannot earn achievements or rank in the leaderboards when this code is enabled.

Achievements
Complete each achievement to get the allotted gamerscore:

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