Completed level 1

Defeated Tsar Tank

Defeated Zeppelin

Defeated Uber Tank

Completed the Campaign

Earned General Rank on a level

Completed a level in Elite mode

Survived until Round 5

Guided a shell to its destination

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

 

Defeated the K-Wagen

Earned a 40x blast combo

Found all of the golden rockets in Invasion

 

Defeated RoboBob

Shot down 40 UFOs with your P-51 Mustang