As much as I wanted to split
It Spreads and
Sneak 100 into individual videos they happened in rapid succession and really have the same background requirements as far as location of items and such so this video is a two for one special enjoy.
Locate a Deep Dark Biome, if you are playing on an older world /realm like I am, go to the edge of the known world and then dig deep underground until you come across a Deep Dark biome the one I found was massive. Once in the deep dark search around for a Sculk Catalyst and a Sculk Sensor (I found some in chests as well as natural spawn).
Kill a mob near the Sculk Catalyst (
within 8 blocks), you will know you are close enough because
green/black bubbles will appear when you kill it. Go in to sneak mode and sneak around the Sculk Sensor. This should pop the achievement for you though as always Minecraft achievement pops tend to have a noticeable delay so just wait a bit.
Video Footage shows Map(s) of the current known world in Realm: Morrowind. A trip through the Nether Tunnel network to reach the edge of the known world, followed by a search for a Deep Dark biome. Once there I find a few Sculk Sensors in a chest then a natural spawned catalyst and sensor. After the achievements pop I warp back to pyramid base and show how to get the achievements in a base once you have the items (this footage is from Windows and my Nvidia capture software does not capture achievement pops however you hear the audio for them.