For boost madness you should be getting that quite often. It's boosting at a certain speed in certain areas. You should be randomly getting it while playing for sure. It's pretty helpful learning where those "boost" spots are. Doing them in the same spot 100% of the time will get you that feat. Learning the tracks and using boost in different areas, and you will be able to do the beat developer a little easier.
For the Snail, it means being in last place for 30 seconds while racing? I might not have gotten that because I always retry if I'm doing bad
Thanks for mentioning it was in the manual, I have it from Gamefly and no manual is present. I am probably missing the Long Jump one, does anyone have a long jump example? Is it just having tons of hang time or is it specific to the long ramps?