Have the Gunner kill 500 zombies.
Rescue 15 refugees in total.
Have the Gunner stun 200 zombies.
Defeat Zombogod with perfect life.
Defeat Zombogod.
Have the Rocketeer kill 500 zombies.
Have 500 critical shots in total.
Kill 1500 zombies in total.
Have the Sniper shoot 750 bullets.
Have the Rocketeer shoot 500 rockets.
Have the Sniper kill 500 zombies.
Kill 100 giant zombies.
Use Bomb of Duty 50 times.
Kill 100 flying zombies.
Use Time Machine 35 times.
Use Air Strike 20 times.
Have the Gunner shoot 1000 bullets.
Have the Sniper shoot through 100 zombies.
Have the Rocketeer shoot 50 extra rockets.
Fully upgrade all characters.
Unlock the Rocketeer.
Unlock the Sniper.
Acquire all gems.
Have 10000 gold.
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