One I got is called "Sweet Revenge". I think its knocking an opponent who has done it to you earlier in the race.
EDIT - I decided to start a list.
1. Off-Road Rage - smash an opponent off the road
2. Smash master - 4x Off-Road Rage in a race
3. MX Monster - land on top of an opponent
4. Speed Master - not sure of exact requirements but boost as much as possible
5. ?Boost Madness - I think in a non boost madness race fill boost guage and use it in one go. actually that does not work but I believe I did see this in a race.
6. Jumper - perfectly land a long jump
7. nail'd fan - most gates
8. nail'd expert - some gates
9. Touchdown - Perfect Landing
10. Punch Bag - perfectly smash into an obstacle such as balloon or windfarm fan
11. Sweet Revenge
13. Looking Down on Them - drive high on a wall, tunnel etc
14. Sniper - rings
Feel free to suggest corrections / additions.
EDIT: Does anyone know the other 2?
Last edited by SatNiteEduardo; 12-21-2010 at 05:46 AM.