Complete the epic difficulty.
Defend the first camp.
Complete the normal difficulty.
Buy your first helicopter.
Repaint a helicopter.
Defeat the first boss.
Escort the first convoy.
Defeat 500 zombies.
Transport a supply to your base.
Defeat 100 zombies.
Upgrade a helicopter.
Defeat 1000 zombies.
Buy all helicopters.
Save the first survivor.
Complete the hard difficulty.
Hire youre first shooter.
Upgrade a shooter.
Own a fully upgraded helicopter.
Collect a special paint job.
Own a veteran shooter.
Upgraded a shooter
Veteran shooter acquired
Upgraded a helicopter
Owned a fully upgraded helicopter
Completed the normal difficulty
Completed the hard difficulty
Completed the epic difficulty
Defeated 100 zombies
Defeated 500 zombies
Defeated 1000 zombies
Bought your first helicopter
Collected a special paint job
Repainted a helicopter
Bought all helicopters
Saved the first survivor
Escorted the first convoy
Defeated the first boss
Transported a supply to your base
Defended the first camp
Hired your first shooter
Platinum
Buy all helicopters
Upgrade a helicopter
Own a fully upgraded helicopter
Complete the normal difficulty
Complete the hard difficulty
Complete the epic difficulty
Kill 100 zombies
Kill 500 zombies
Buy your first helicopter
Collect a special paint job
Repaint a helicopter
Save the first survivor
Kill 1000 zombies
Escort the first convoy
Kill the first boss
Transport a supply to your base
Defend the first camp
Hire youre first shooter
Upgrade a shooter
Own a veteran shooter