The endergirl related achievements arent working for me. Left it running for about 15 min + plus and never got either of the locations.
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For the first endergirl achievement you need to use the enderbeads, so you can't just leave it running. You need to either make her cum with them (the slow method) or make them "no-clip" through her (the faster method). The best way I have found is to push them into her belly from the outside, they will pop and reset each time you get it right and she will teleport to a random new biome, so just keep doing it until you get the right one. As for the 2nd one, you do not need to use the beads, but she needs to be in the box and I believe she needs to be in the bamboo forest.