First BloodFirst Zombie Kill
Meat GrinderKill 400 zombies in this loop
Triple DefenseDeploy 4 spikes, 4 electric nets, and 4 chainsaws each
The door is closedKeep Front Door Durability above 80% during a crisis.
Iron WallUpgrade all doors and windows to the highest level
Sea of the DeadHave 50 zombies on screen at once during a single horde
Zero BreachKeep all doors and windows above 70% throughout the final zombie wave
Rat CatcherCatch 8 rats in total
Experience Makes the DoctorSurvive a total of 3 crises