TechLookz

Unlocks all levels:
On the mission select screen, hold both the left and right bumpers then quickly input on the d-pad left, left, right, right, then Y, Y

Infinite Ammo:
On the main menu press the left analog stick left, left, left, right, left, right, Y, Y.

Gamer points for xbox live's:
Every Xbox 360 game has a total of 1,000 achievement points that can be unlocked & added to a gamer's xbox live gamer score.

Unlockable: How to Unlock:
150 Pts - Won the War (finish the game on any difficulty)
200 Pts - War Hardened (finish the game on hard or Veteran)
50 Pts - Completed Training
60 Pts - Veteran of Crossing the Rhine
60 Pts - Veteran of D-Day
60 Pts - Veteran of El Alamein
60 Pts - Veteran of Fortress Stalingrad
60 Pts - Veteran of Hill 400
60 Pts - Veteran of Rommel's Last Stand
60 Pts - Veteran of Stalingrad 42
60 Pts - Veteran of the Battle for Caen
60 Pts - Veteran of the Tank Squadrons
60 Pts - Veteran of the Winter War

Britsh Campaign:
Beat the Not One Step Backwards (Russian Campaign Two)

American Campaign:
Beat Rommel's Last Stand (British Campaign Three)