Hire new heroes.
Hunting zombies.
Complete Mission 10.
Complete Mission 20.
Complete with a perfect STAGE 1.
Complete Mission 30.
Complete with a perfect STAGE 2.
Complete with a perfect STAGE 3.
Complete with a perfect STAGE 5.
Complete with a perfect STAGE 4.
Complete with a perfect STAGE 6.
Complete with a perfect STAGE 7.
Complete with a perfect STAGE 9.
Complete with a perfect STAGE 8.
Complete with a perfect STAGE 10.
Achieve first place in the ranking METER
Achieve first place in the ranking KILL
Achieve first place in the ranking RICH