Completed Basic Training.

Finished The Winter War on Veteran difficulty

Finished "Not One Step Backwards!" mission on Veteran difficulty

Finished Fortress Stalingrad mission on Veteran difficulty

Finished The Battle of El Alamein mission on Veteran difficulty

Finished The Tank Squadrons mission on Veteran difficulty

Finished Rommel's Last Stand mission on Veteran difficulty

Finished The Battle for Caen mission on Veteran difficulty

Finished D-Day mission on Veteran difficulty

Finished Hill 400 mission on Veteran difficulty

Finished Crossing the Rhine mission on Veteran difficulty

Finished the Single Player Campaign

(6) 

Finished the Single Player Campaign on Hardened or Veteran difficulty setting