Getting the Minecraft Caves & Cliffs Achievement, which is free fall and survive from the Height limit 320 to the bottom of the world -60 was -62 for me.
How to: Dig down 1x2 hole until you hit -60. Place water, then tower up to 320. It will now be a 1x1 hole. Carefully step to the edge and fall while being centered on the block. It can take up to 1 minute for the Achievement to unlock.
Gl to anyone who tries. This seemed to be the simplest way.
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