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