Shredders

Here's my achievement guide for a bunch of easy miscellaneous achievements, including this one.

I first got this a bit farther on, on the Castles Made of Snow level.

1. This is at the steep hill with 5-7 jumps lined up side by side that say "King".
2. At the second set of jumps, to the left of the king sign, I go off the jump by pushing forward, and then pulling back as I go off the jump to get spinning.
3. On my second spin, I started spinning to where it said "double backflip, and pulled back".

I think this could be hard to redo, so the other spot I did it soon after was at the level Spin Dizzy.

1, At the kings signs again, to the left of the big snow structure with the crown, I went off that jump.
2. Same principle, did the double backflip, and I had a super messy landing, but still landed the double backflip.