Hello, i've been wating for some other people mentioning this or giving out guide whats going on wrong but since i cant finding decided to write this:
So, the achievement: "Illuminating Amnytas" has 3 troublesome lanterns wich are:
Spellcrafting Workshop
Mabon's Tower
*(this is kind of) Museum of curiosities:Main Gallery
i've spent over 2hour in total trying to hump mabons tower/spellcrafting workshop all walls and floors/levels without any succes on locating these lanterns and i suspect theyre bugged and possibly in some walls or something along those lines due to the fact that the: "Museum of curiosities:Main Gallery" i actually found with ½hour of humping all walls and eventually with luck i actually managed to find it with the lanterns name clipping trough a one pillar( it is legit 100% inside a one of the exhibition pillars). If any of other players have managed to find them please do reply so we can get those juicy 2 achi points.
EDIT: The 2 first options are waaay out of the POI:s and the museums one is inside the pillar but with the wiki map you should be able to pinpoint them.