Here is the full list of all 20 Dustoff Z achievements.
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 youre 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.