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