Get a 40x blast combo
Find all of the golden cubes in The Kaiser's Battle
Defeat the K-Wagen
Survive until Round 5
Find all of the golden rockets in Invasion
Defeat RoboBob
Shoot down 40 UFOs with your P-51 Mustang
Complete Campaign+ and earn all Ration Tickets
Complete any level in Elite mode
Earn General Rank on all Campaign levels
Complete the Campaign
Defeat Uber Tank
Defeat Zeppelin
Defeat Tsar Tank
Guide a shell to its destination
Complete level 1
Earn General Rank on any level
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