Take down 25 enemies while riding on the roof of a moving vehicle.

Take down 100 enemies while they are airborne.

Bad guys love to be seen.

Thunder Drop for a total distance of at least 500 meters.

Good guys stand up and take the heat.

Good guys feed the needy.

Complete a level online with 3 other players who are not on your friends list

Complete "Jabber Man" challenge

Complete "Incoming!" challenge

Complete "Kaboom" challenge

Complete "Blood Trial" challenge

Complete "Swinger" challenge

Complete "Close Up" challenge