ENDINGS LIST (SPOILERS):
Draft a Constitution
Win the game by setting up a government for your new country. - Performed at: City Hall - Requires: at least one police station, hospital, school, lab, at least 50% happiness and 5 leaders. - If playing on after game won: permanent 100% happiness
Destroy the Evil Portal
Win the game by destroying the source of the zombie hordes. - Performed at: Evil Portal - Requires: At least 5 defensive buildings (police, defended malls and allmarts), 50% happiness and 15 soldiers. - If playing on after game won: zombie hordes stop spawning
Cure Zombieism
Win the game by curing zombieism for good. - Performed at: Laboratory - Requires: all tech researched, at least 3 laboratories, 50% happiness and 5 scientists. - If playing on after game won: regular zombies stop spawning
Conquered Map
Win the game by reclaiming every square on the map. - Requires: nothing but time