Unlock all farm buildings.

Rescue 50 Survivors.

Rescue 75 Survivors.

Heal 20 times using the Nurse.

Heal 40 times using the Nurse.

Kill 10 enemies using the Soldier's Flame Thrower.

Kill 20 enemies using the Soldier's Flame Thrower.

Get poisoned 10 times.

Reach the City.

Discover the Catacombs.

Finish the True Ending.