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