Complete the first main mission objective.
Twofer
10Kill two enemy vehicles with one rocket.
Dead Island
20Purge the island of the dead.
Pointdexter
15Score at least 500,000 points in a single mission.
Pedro 4 Prez
30Find and eliminate Pedro in all locations.
Kill 100 enemy helicopters.
Demolicious
20Destroy 1,000 buildings.
Complete a mission in co-op mode.
Parselmouth
15Complete the 'Stomp The Snake' mission on expert difficulty level in co-op mode.
Rock It Man
20Complete a (non-tutorial) mission using only rockets.
Gun Guru
25Complete a (non-tutorial) mission using only the machine gun.
High Five!
15Destroy your chopper with your own guided rocket.
Collect all 25 crates hidden in various locations.
Quickie
20Complete a (non-tutorial) mission in 8 minutes or less.
Kamikaze
20Kill 10 vehicles by smashing into them.
Kill a boss/miniboss by smashing into it.
Locate and winch up the Lost Ark.
Complete at least one mission with each helicopter.
Courage Wolf
30Complete all levels at least normal difficulty.
Star Wolf
30Get all stars in all missions.