Mafia
  
Xbox
  

Race Mode:


Beat every mission in Story mode.

Extra cars in Free Ride:


Steal a car in Story mode and it will be unlocked in Free Ride.
Bigfoot truck in Free Ride:

 
  Get first place in every race in Racing Championship.
Day and Night:


  Beat Story mode to open up the Day/Night option in Free Ride. 
 

Thanks to Revolution readers Chooser and Martin!