If you talk about FFXIV, then.. kinda. You can slog through them solo and it's tied to some (as of yet afaik never obtained achievments), but it really only works solo for a hand full of classes that have the burst and healing to manage it. Redmage was one of the hottest contenders for a while for example, complete dogshit for monks though.
Also the implementation is heavily used for alt job leveling and mostly boils down to rushing each floor to the boss and then reset and doing it again. The actual challenge part (becomes more relevant on later floors) is not really used by most, though it is an option I guess. The places are mostly popular for the high EXP reward (averaging a level per hour in the later one) and the fact that it uses it's own internal leveling system which means you get to use abilities above your level* which makes low level jobs more bearable.
The rewards are mostly cosmetic item sets, pets, mount barding and decorative items as well, in that regard it's very much like Island Expeditions. The difference is that it's styled like a rogue-like and you don't have to fight against the clock (the 90 minute time limit is way more than even the worst F players would need), which is something that WoW is really missing I guess. Everything is focused on speed running these days.
*(especially noteworthy for the 1-60 version, as you essentially get to use level 60 abilitites after the first 40 floors and people can start at 51 once they've done it on one character, meaning you can be actually level 1 and can use all available abilities up to level 60 inside)