Grounded

This achievement is pretty late game-y considering the amount of Raw science and materials you will need to have. If this is something that can be done via multiplayer feel free to reach out to me whenever I'm on and I can help you if I'm available.

I got this by zipping down from the Bird fountain(Next to Koi pond/Berry forest/Password puzzle) to my old base far away. You will need 7500 Science to even learn the Zipline and I think you will have to do the "Password Puzzle" I call it from Burgle that is in the Berry forest with all the ziplines. Make sure to do your daily quests and collect any raw science along the way.

One you learn Ziplines you will need to get a lot of materials such as Clay, silk(Made from spinning spider webbing at the Spinning wheel(Analyze acorn top)) and a bee stinger. Bees can be found flying about usually around flowers or if you can make it, the work-in-progress bee hive. I strongly recommend bringing some lure arrows(Arrows and flower petals) because they are a pain to hit out the sky.

Build your way up to the fountain, you can use ladders(requires I think 2000 or 2500 raw science to learn), a combination of Ramp/floor pieces or there are some branches in the trees you can glide down on. You can use trail markers as well to get an idea of the distance you have to go. The zipline is a bit wonky with where you have to place it so I just built a floor, with 1 wall and attached it to the wall. Zip down and boom!