Successfully complete the game under the difficult difficulty setting.
Full team health
Die four times after a save point and you will be asked if you want to heal your squad.
Infinite ammo
Successfully complete the game under the normal difficulty setting.
Old Movie
Successfully complete the game under the easy difficulty setting.
Super squad
Successfully complete the game under the authentic difficulty setting.
The All-Americans
This level is separated into two parts, and you get an unlimited supply of Panzerfausts. Even if your squads get wiped out by the time you get to the second part and you are low on health, you can still complete the game by carefully and patiently using the Panzerfausts at long range. The general strategy is simple. Grab a Panzerfaust from the nearer of the two crates and slowly approach the enemy position until you see the red 'unsuppressed' circle above them. Stay out of their range or take cover, and aim directly above the circle -- slightly if they're close or way above if they are a long distance away, and fire. Use situational awareness mode to see if you hit or missed, then repeat the process. With trial and error you should be able to wipe out all four groups of Nazis, including the one manning the 88, all by yourself while taking little damage.