Save the Ninja Clan

Earliest place to get this achievement would be the first level: "1 Tutorial", at the very end of the level, once you reach the platform that has the scroll on it, instead of walking and grabbing the scroll, you will see a flashing platform just ahead, simply double jump OVER the scroll and land on that flashing platform, and proceed right, until the dev/creator freezes you and then brings you to level 2.

Note: Completing the level using this secret instead of grabbing the scroll will not unlock the achievement for completing level 1. Don't fret however, you can simply go back to level 1 and do the level over and grab the scroll. (Takes about 15 seconds).