In Chapter 1-4 "BLACK ROCK CANYON" you will come to a section where you need to get one of the Spikester enemies (the red monsters that have killer blades shoot out from the shell when you get too close) to walk under a hanging pod looking monster. The pod thing will grab the Spikester, pull it up, and then fall off the rock, which leaves the Spikester to continue walking around but with a safe platform on top of it that you can jump on. Simply jump on top of it, and just stand there for > 10 seconds and then Achievement will pop.