You have Spoke to your wife and escaped

You have Reached the ghetto and have met the leader

You have Found all 3 radioactive items at the police station

You have Defeated all zombie enemies before escaping

You have Completed all the mission in single player campaign

You have completed the city

Escaped the subway after killing zombies

Steer a boat across the river

You have Killed the zombie boss the abandoned school

You have Crossed the bridge and have escaped unhurt

You have Killed the zombie skeleton boss in the abandoned factory

You have met your wife in the factory

You have Rescued your wife from the factory