I'm not sure if this is an achievement, not even sure if any monkcher solo is, but I had some fun, and since I haven't seen others doing it, I decided to upload some screenshots.
The first boss:
The second boss in progress: (I had my thaarak tank the spider while I killed the ranger)
And done:
Took about 40 minutes, and 30 heal scrolls.
My build is sort of out-dated at the moment, but here it is in great lines:
My level split currently is 12 monk/7fighter/1arti (should get a +1 heart to change a fighter lvl to arti), ninja spy II, SD I, rog dilly. I aimed to get 42 wisdom ("unlocks" chance for 4th arrow with 10k stars), I use either Resilience or Precision (switching between them according to the situation). My epic feats are Combar Archery and Bulwark of Defense. My main destiny is obviously Shiradi Champ, and I'm twisting Sense weakness, Enlightment and usually +6 reflex on the 3rd slot (sometimes switching to dragonhide for quests like e/e von3, or more action boosts in case if I don't need reflex). I have a monk and three ranger past lives.
All my gear, enhancments and destinies need some fixing now (special thanks for screwing Stay Good with 15.2), but I'm kinda lazy and my toon works just fine as it is.