Play Co-Op mode for 5 minutes
???
Destroy 5 ground enemies with your aircraft
Upgrade a weapon
Complete Mission 01
Kill 150 enemies
Melee kill 10 enemies
Kill 20 enemies with grenades
Destroy 50 vehicles
Kill 6 enemies with a single grenade
Upgrade all weapons
Kill 3,000 enemies in total
Complete a vehicle minigame without getting hit
Complete any mission without dying
Earn 15,000 dollars
Use all special ammo and weapons
Find 5 collectables
Find all the collectables
Complete the game on any difficulty
Complete the game on hardcode difficulty
