This achievement is reached in the Summer Forest homeworld. The Hunter is a cheetah standing on two legs with a bow on his back, who appears at the top of a ledge. Approach him to start his challenge, it will involve a series of jumps -- he'll perform the jump, then instruct you how to perform it. The jumps will get more difficult, and at the end when you've completed all, a cutscene will appear in which he gives you an orb and the achievement is unlocked.