https://www.dropbox.com/sh/qeswcgkt6pah7aa/AACrIRqqZB5OrysSM...Note: Host only. You can not unlock this achievement by joining yourself or someone else on a different device.
In this world, kill the ender dragon, then take the teleporter, and press skip to skip the credits. This will take you back to the main world. Then, head over to the area in the back where it says update 1.0. In there, enter the portal on your right.
Then, use some blocks to make your way up. Then, go to the center of the large poles. Here's you will find the teleporter. Instead of using it, place an end crystal on the center of all 4 rows of 3 bed rock rows. (teleporter consists of 4 rows of bed rock, each having 1 piece of bed rock in between. Place the end crystals on the center of all 4 rows of 3 bed rocks, so 4 crystals total)
Image for those who are unsure how to place the ender crystals: