Here is the full list of all 12 OlliOlli trophies - there are 8 bronze, 3 silver and 1 gold.
Beat all Levels on Rad Mode
Land 1 of every Trick
Find the 5 Hidden Golden Skateboards
Get a Score of 2M on a Spot
Unlock all Pro Challenges
Unlock all Amateur Challenges
Land a 2M Point Combo in Career
Set a Score on 25 different Spots
Achieve a total of 1000 Perfect Grinds
Achieve a total of 1000 Perfect Landings
Land a Combo of x25 or more
Land a 540° Spin