Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock	Points
Airbone	Kill 100 flying zombies.	30
Attack on Giant	Kill 100 giant zombies.	30
Big Bang	Use Bomb of Duty 50 times.	50
Bomb Addict	Have the Rocketeer shoot 500 rockets.	50
Captain ZBR	Fully upgrade all characters.	25
Colossal Zombie	Defeat Zombogod.	20
Dragunov Effect	Have the Sniper shoot through 100 zombies.	50
Evil Resident	Kill 1500 zombies in total.	30
Guerella Trooper	Rescue 15 refugees in total.	30
Infinity Bullets	Have the Gunner shoot 1000 bullets.	50
Let's Talk About Life	Defeat Zombogod with perfect life.	40
Like A Sir	Acquire all gems.	50
Moneyman	Have 10000 gold.	50
Piece of Cake	Have 500 critical shots in total.	30
Portable Katyusha	Have the Rocketeer shoot 50 extra rockets.	50
Rocketeer Madness	Have the Rocketeer kill 500 zombies.	50
Silent Shooter	Have the Sniper shoot 750 bullets.	50
Sniper Mystery	Have the Sniper kill 500 zombies.	50
Stunning Shooter	Have the Gunner stun 200 zombies.	50
The Bombard	Unlock the Rocketeer.	30
The Call Down	Use Air Strike 20 times.	70
The Marksman	Unlock the Sniper.	30
Tic Toc	Use Time Machine 35 times.	35
Zombie Parade	Have the Gunner kill 500 zombies.	50