Shredders

Here's my achievement guide for a bunch of easy miscellaneous achievements, including this one.
This can be done not too far along, as the continuation of the Meet the Snowmobile level, which will be the What Goes Up Level.

1. This level is a straight shot down the mountain, at high speeds, in deep snow.
2. Ride down the mountain, and redo the level a few times for the achievements.

I can't think of a better/faster early on level. Also, feel free to practice some spins on the mountain peaks!