Note: achievements may not pop immediately, or may not show as having popped. Look at the achievement button in the game to see.
Posting this for Itzz Sh0wt1m3
since he doesn't have a Gear VR right now.
You're going to want to go here to his dropbox for achievement worlds:https://www.dropbox.com/sh/qeswcgkt6pah7aa/AACrIRqqZB5OrysSM...
Once you've unzipped it, go to on your device and open the folder: /sdcard/games/com.mojang/minecraftWorlds
(If you are running this off your phone, leave just look for the games folder in the root directory.)
Open the unzipped folder. You'll see another folder. Move this into the minecraftWorlds folder. Yes, copy all the files when it asks. Now play the world.
You should start with a very weak Ender Dragon above you. If you like (and it's a good idea to do now), use a potion in your inventory to get a glass bottle and capture some Dragon Breath for this:
Kill the dragon and pop the achievement.