How can I get the achievement no clip
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If I remember correctly there are 2 ways, you can use the ender beads to make the ender girl cum and there is a small chance she will teleport you to the backrooms (giving you the achievement), or you can force the beads to clip through her stomach (get them fully inside her then use the piston or push them into her stomach from the outside) for a higher chance. Whichever way you choose just keep repeating it, and you should get it pretty easily.