Complete the following tasks to unlock ATV.

Unlockable	How to unlock
ATC	Complete Arcade Mode.
Blaster	Earn 5 More Gold Medals In Career Mode.
Challenger	Earn 7 More Gold Medals In Career Mode.
Dimension	Complete Control Training In ATV Academy.
Eagle	Earn 12 More Gold Medals In Career Mode.
Skyrider	Earn 2 More Gold Medals In Career Mode.
Storm	Earn 10 More Gold Medals In Career Mode.
Viper	Complete Trick Training In ATV Academy.