I'm relaying this for my friends, who are in the middle of the dungeon right now.
Edited by rhapsodious on August 19, 2016 3:01AM
The achievement text: "Pass through the spider caves in Veteran Cradle of Shadows without lighting more than two braziers."
We are all assuming that the "spider caves" are the section that contains Sithera and Khephidaen, and that the area comprises of the initial ladder you go down up until after Khephidaen where you re-emerge on the landing that allows you to pull the lever to open the door. And yes, they are on Veteran.
My friends (at least one of whom will soon post following this) have done just that. They didn't light any braziers on Sithera (and took like 15+ minutes, they tried skipping her but she pulled anyway), lit no braziers between boss fights (i.e. slogged through spider hell the hard way), and only lit a single brazier on Khephidaen when she shut off all the braziers. They exited the spider caves, pulled the lever, and at the time of writing have gone through the big door and have still not received credit for the achievement.
Do they need to finish the dungeon for the achievement to be earned, or is there a bug? Has anyone earned this? They all just bug reported it and, to put it mildly, will not be happy if they went through this for nothing.