Minecraft: Xbox 360 Edition

to get an ender pearl, you need to deal with an enderman and pick the pearl up after the enderman has been slain. once in possession of the pearl, take 2 stacks of 64 of any block (i used dirt) and place them under you by jumping and placing a block. once on top of the 2 stack pillar (128 blocks high) simply throw the pearl using left trigger. do not worry if the pearl looks like it disappears it takes a while to drop all the way down. the achievement unlocks once you spawn on the ground.

*edit* according to mama berry, you can trade with one of the purple robed 'cleric' villagers in the village, near the starting spawn in the Elytra tutorial world, a couple of times. There's enough emerald blocks lying around to have more than enough emeralds! After a couple trades they should hopefully offer Ender Pearls, likely between 5-7 emeralds a piece. Hope that helps!

*edit2*gobey17 pointed out that the cleric villager spawns in the village to the left in the elytra world (at X: -97, Y: 86, Z: -37)
You do however need a handful of gold ingots to start off with to give to the cleric in exchange for a emerald (meaning having to mine a gold block with a iron pickaxe to make some, which one block can be found where the Elytra wings are on a small pillar). Then just gotta give a few more emeralds to get the ender pearl. Thanks for the tip Mama Berry!

so there are 2 ways to do this from what i see.

1. kill an enderman and get the pearl. stack up 2 blocks and throw the pearl forwards (at the horizon ((horizon goes left to right))). done
or
2.take the blocks or iron from the chest at X:-30, Y: 80, -79. there is wood right next to it and a crafting table. make yourself some iron pickaxes.
at X: -23, Y: 86, Z: -121, there is a gold block. across from it, at X: -9, Y: 86, Z: -119, are 2 blocks of emeralds. take those down as well. using the gold and the emerald, trade with the purple robbed cleric villager at X: -97, Y: 86, Z: -37 to obtain the ender pearl. make an iron shovel and dig in the hillside for dirt, or use the iron pickaxe for cobblestone. get 2 stacks go all the way up and throw the pearl at the horizon.