Defeated the K-Wagen
Earned a 40x blast combo
Won a Multiplayer Match on every level
Survived until Round 5
Completed a level in Elite mode
Guided a shell to its destination
Completed the Campaign
Defeated Uber Tank
Defeated Zeppelin
Defeated Tsar Tank
Completed level 1
Earned General Rank on a level
Earned General Rank on all Campaign levels
Completed Campaign+ and earned all Ration Tickets
Found all of the golden cubes in The Kaiser's Battle
Found all of the golden rockets in Invasion
Defeated RoboBob
Shot down 40 UFOs with your P-51 Mustang