Buy your first helicopter

Buy all helicopters

Save the first survivor

Escort the first convoy

Defeat the first boss

Transport a supply to your base

Defend the first camp

Hire your first shooter

Upgrade a shooter

Own a veteran shooter

Upgrade a helicopter

Own a fully upgraded helicopter

Complete the normal difficulty

Complete the hard difficulty

Complete the epic difficulty

Defeat 100 zombies

Defeat 500 zombies

Defeat 1000 zombies

Collect a special paint job

Repaint a helicopter