Naughty, naughty Destroy 1500 destructibles in Slaughter mode. - go into slaughter mode and destroy 1 object.
My favourite color Earn a gold medal on all original arenas in Slaughter mode. - earn a medal in slaughter mode.
Pimp Car Fully upgrade one car in Story mode. - go into story mode and buy all upgrades for the taxi.
Fair play Kill 100 enemies in the Blood Race mode. - start a blood race. (i only killed a zombie so i'm not sure if it will pop at the start of the race)
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