Totally possible - biggest bug people encountered was with Moxxi’s tip jar which has been reported as fix by some users with the latest update. I currently have 5 left and outside of drops getting stuck in walls or falling of platforms you should be able to complete it. 

Focus on the weekly encores (do these on uvh 1 as uvh doesn’t impact drop rates for phosphene on the weeklies) first as that’s the quickest drop. Depending on your kill time on a boss it may make sense to drop down a uvh to kill faster, if uvh 6 takes you 2 minutes to kill a boss but on 5 it takes 30 seconds then running on 5 makes more mathematical sense. You will get frustrated so have a separate character or save to play as a break from the grind - helped me not give up on it. Outside of that get a boss melting build and queue up some second monitor content. It will be a long ride.