CheatCodes.com has the complete list of all Contra Achievements and Gamerscores for X360, including all secret Achievements. All official X360 achievements for Contra as of Saturday August 30, 2014 are shown below, or you can print out our Printable Achievements Checklist that shows all Contra Achievements and Gamerscores in a simple quick-reference format.
Collect 4 different weapon power-ups.
Score 100,000 points in an Xbox Live Co-op game.
Get to the first tunnel without losing a life.
Beat the first timed tunnel with 33 seconds or more left.
Destroy the alien tower at the end of the water level.
Beat the second timed tunnel with 55 seconds or more left.
Collect 3 different weapons in the second tunnel.
Get to the second tunnel without obtaining a single weapon upgrade.
Complete the second tunnel with a score of 100,000 or more in Arcade mode.
Complete the game in Xbox Live Co-op mode.
Complete the game in Arcade mode using only 1 credit.
Complete the game in under 12 minutes.