Successfully complete one of the following tasks to get a trophy:

  Demolition Master (Bronze): Hit 15 objects in any single player level 
  (original content). You must earn a bronze medal or higher in order to unlock 
  the trophy. 
  Air Time Expert (Bronze): Get 75 seconds of air in any single player level 
  (original content). You must earn a bronze medal or higher in order to unlock 
  the trophy. 
  Star Collector (Bronze): Accumulate 270 stars in single player mode using your 
  best score from each level (original content). 
  Trickster (Bronze): Complete 15 air tricks in any single player level 
  (original content). You must earn a bronze medal or higher in order to unlock 
  the trophy. 
  Lap Champ (Bronze): Beat all base lap times in every single player level 
  (original content). 
  Race Ace (Bronze): Beat all base race times in every single player level 
  (original content). 
  Smash Cars Superstar (Bronze): Get 30 stars in one single player level 
  (original content). You must earn a bronze medal or higher in order to unlock 
  the trophy. 
  Smart Driver (Silver): Find all the shortcuts in every single player level 
  (original content). You must earn bronze medals or higher in order to unlock 
  the trophy. 
  Safe Driver (Silver): Complete all single player levels without crashing or 
  using any respawns (original content).