Survive 15 waves.
Not unlocked yetSurvive 15 waves.
Survive 20 waves.
Not unlocked yetSurvive 20 waves.
Survive 25 waves.
Not unlocked yetSurvive 25 waves.
Survive 30 waves.
Not unlocked yetSurvive 30 waves.
Evacuate by helicopter.
Not unlocked yetEvacuate by helicopter.
Purchase beverages.
Not unlocked yetPurchase beverages.
Purchase weapons.
Not unlocked yetPurchase weapons.
Kill zombies.
Not unlocked yetKill zombies.
Melee expert.
Not unlocked yetMelee expert.
Clear the urban area.
Not unlocked yetClear the urban area.
Clear the construction site.
Not unlocked yetClear the construction site.
Complete the foggy railway level.
Not unlocked yetComplete the foggy railway level.