On Top of the World is an exploration achievement in Deradune. Climb to the top of three canopy trees in Bloodfire Savanna to complete it. Disable double-tap dash (left of your action bar there is a small, crossed circle next to a counter) so you can make micro-adjustments while climbing. For each entry you have to be on certain location, and it’s for the best if you open the achievement tab and watch each entry as you climb up; don’t stop until it becomes green. One tree has a datacube on the top and there are two challenges connected to certain canopy trees. Challenges are unlocked as soon as you climb to the top or at the beginning of climbing.
 
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