Hot Air
Use in-air cooling to entirely cool your full Boost gauge from Critical in a single jump.
2/15/2012
4:48:02 PM
Rare 16.0%
Variety is the Spice of Life
Complete a race in all of the standard game modes.
2/15/2012
4:46:47 PM
Very Rare 9.0%
Grease Monkey
Swap out at least one vehicle part on each of the 13 vehicle classes.
2/15/2012
4:36:40 PM
Very Rare 6.1%
Air Assault
Punch a fellow rider off their bike or ATV while you're both in mid-air.
2/15/2012
4:07:56 PM
Very Rare 7.2%
"If you start, you got to finish..."
Complete 'Final Drive' as Big Dog.
2/15/2012
8:26:18 AM
Very Rare 9.1%