I noticed there's an issue with completing side achievements, where some of them fail to complete, even if you fulfill the criteria, if you failed prior on that run and reset the boss the achievement is gained from to try again.
Some achievements for some dungeons are fine when you reset the boss and try again, but others (Minimal Animoity from Fang Lair, Root of the Problem and On a Short Leash from Moon Hunter Keep) do not abide by this and require you to be successful without being able to reset the boss to try again if you fail.
I am not sure if it's intended, but I believe it's a bug (and quite an annoying one), so I wanted to make mention of it here in hopes it can be fixed for current and even future achievements following the same rules.
@Djennku, PCNA.
Grand Master crafter, all styles and all furnishing plans known pre U41.
Vamp and WW bites available for players.
Shoot me an in-game mail if you need anything, happy to help!