Found the list finally.
Bronze
Demolition Master
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
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
Accumulate 270 stars in single player mode using your best score from each level (original content).
Trickster
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
Beat all base lap times in every single player level (original content).
Race Ace
Beat all base race times in every single player level (original content).
Smash Cars Superstar
Get 30 stars in one single player level (original content). You must earn a bronze medal or higher in order to unlock the trophy.
Bronze Champion (Hidden)
Earn a bronze medal, or better, in every single player level (original content).
Silver
Smart Driver
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
Complete all single player levels without crashing or using any respawns (original content).
Silver Champion (Hidden)
Earn a silver medal, or better, in every single player level (original content).
Gold
Gold Champion (Hidden)
Earn a gold medal in every single player level (original content).
also here is a trailer for it
http://www.gametrailers.com/video/e3-09-smash-cars/50868
. Watch them be all hidden too 
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