In this achievement, you are required to beat Level L-2 without jumping.
This achievement is easiest with the Lizard, but the Runner and the Pastafarian can also pull it off. All you have to do is follow the snaking path all the way through the level. The Duplicator can also be used to pull this achievement off. You can just follow the snaking path also and if you fall off the platform one of your duplicates will take your place instead.