Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Airbone (10)	Kill 100 flying zombies.
Attack on Giant (10)	Kill 100 giant zombies.
Big Bang (11)	Use Bomb of Duty 50 times.
Bomb Addict (11)	Have the Rocketeer shoot 500 rockets.
Captain ZBR (11)	Fully upgrade all characters.
Colossal Zombie (11)	Defeat Zombogod.
Dragunov Effect (11)	Have the Sniper shoot through 100 zombies.
Evil Resident (11)	Kill 1500 zombies in total.
Guerella Trooper (10)	Rescue 15 refugees in total.
Infinity Bullets (10)	Have the Gunner shoot 1000 bullets.
Let's Talk About Life (11)	Defeat Zombogod with perfect life.
Like A Sir (11)	Acquire all gems.
Moneyman (11)	Have 10000 gold.
Piece of Cake (11)	Have 500 critical shots in total.
Portable Katyusha (11)	Have the Rocketeer shoot 50 extra rockets.
Rocketeer Madness (11)	Have the Rocketeer kill 500 zombies.
Silent Shooter (11)	Have the Sniper shoot 750 bullets.
Sniper Mystery (11)	Have the Sniper kill 500 zombies.
Stunning Shooter (11)	Have the Gunner stun 200 zombies.
The Bombard (10)	Unlock the Rocketeer.
The Call Down (11)	Use Air Strike 20 times.
The Marksman (10)	Unlock the Sniper.
Tic Toc (11)	Use Time Machine 35 times.
Zombie Parade (11)	Have the Gunner kill 500 zombies.