Collect enough lums to unlock 10 Heroes paintings in the Heroes Gallery

Go fast enough to save 3 Teensies in an Invasion painting

Win a Gold cup at the end of a Challenge

Ignite a brush fire using the repair tool in Operation Metro or Caspian Border

Kill an enemy with a ceiling collapse in Operation Metro

Get a kill with the Dirtbike

Win a Silver cup at the end of a Challenge

Scratch 10 lucky tickets

Finish your first "Back to Origins" painting

Complete the Gallipoli Operation

Stand on top of an enemy with a shield until he tries to attack you

Win a Bronze cup at the end of a Challenge

Reach Support Rank 2 in multiplayer