The labyrinth itself is incredibly easy. Nothing is difficult, or interesting. Its not a labyrinth, its 3 delves duct taped together. There's no "branching paths" or "interesting buffs" or things that alter how you play. This isnt torghast (and in this case i unironically prefer torghast over labyrinth). its quite literally a series of 9 corridors where you just get to pick which corridor to do first, but you gotta do them all anyway.
The problem lies in the fact that a bunch of events in the rooms can bug out. And when they bug out, you have to fully abandon the run and restart. You cant pause, you cant refresh, you cant collect your existing rewards - if you start a room and its buggy, thats it. You abandon the run and start again.
Imagine doing 5 rooms and then 6th one is bugged, so you just wasted the time clearing 5 rooms. Now repeat this 5-6-7 times until you finally get a non buggy run.
But hey. At least the boss at the end is challenging, right?
Not really.
To say that the boss was underwhelming would be an understatement. Im pretty sure proving grounds scenario is harder than the T11 labyrinth boss. It is honestly silly just how easy that fight is, compared to the hype they put around it.
So yeah. I would say if you want your easy fabled achievement, just put on something on netflix and then suffer for an hour or two resetting labs until you get a non-bugged run, then collect your rewards.
At no point in the (non-bugged) run did i feel challenged, threatened, or in danger. Literally, at no point.