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Portal 2 Hints
How can I get the Pturretdactyl achievement here?
1 of 5: You'll need the malfunctioning turret for this one.
2 of 5: Before you hit the pedestal's button to release the garbage, relocate your portals so that both of the slanty extended wall panels are portal-free, then quicksave.
3 of 5: After you hit the button, wait for all of the garbage to bounce over to the extended wall panels' ledge. Some of it will bounce into the toxic liquid, but the turret should end up on the ledge.
4 of 5: Get over to the ledge by putting portals on the lower extended wall panel and the exit platform's portal-friendly wall section, then check to make sure the turret is there. If it's not, quickrestore and try again. If it is, use portals to get it and yourself back to the chamber's starting area.
5 of 5: Carry the turret over to the first aerial faith plate, then drop it when it's right over the plate. That'll get the plate to throw it, and you'll get the Pturretdactyl achievement.