Armageddon Riders

Basically the whole of the cities pedestrians have been transformed into Zombies. You cannot miss these at all. They basically walk the streets and roads. Just smash into one with your car and it will count as Crushing one zombie. Kill 6666 for this trophy to pop. Zombies also give your Car energy (boost). So you'll be hitting them over and over anyway. Don't go out of your way to kill them as this will just come with time while completing missions and chasing down marked cars