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