Please note: all credit goes to Volgore!
How to get the achievement Soared and Board (Smash all Bonus Boards in Hot wheels Park).
All Bonus Boards in Hot Wheels Park
Here you will be able to find the location of the 25 XP Bonus Boards.
As a tip, usually you will have to go to an area where you can leave the Hot Wheels tracks and drive ‘cross country’ to the area indicated on the map. These areas are highlighted in orange.