Untethered Achievement
Don’t get hit by anything including the enemies.
Either it is bugged or the description is misleading.
The description in Dulfy is inaccurate. You CAN get hit by mobs and succeed. What you have to avoid is getting hit by the vines and red circles on the helix. And you cannot die (or be downed) even once during the instance. Do those two things and you get the achievement. You do not have to clear all the mobs on the helix nor do you need to destryoy the vines blocking the path (as I have seen on some vids). I used my scrapper and bypassed most mobs in stealth (ended up killing some) and ran around some of the vines. Once you get to top and jump to the Faolin platform you get thr ach. Plenty of places along the helix on the edges you can stand and avoid the red circles. Kill what mobs you need just don’t get downed or die.