OlliOlli2: XL Edition

Skatepark is the tutorial system in the game. You will not be able to learn all of the skills right away though. You will reach certain points in the career where you will be asked to do something special (i.e. land 2 manuals) and that will unlock that specific level in skatepark. Once you have unlocked all the skatepark levels and completed them then you will unlock this achievement easy!