Is 100% completion possible?

[Zeravu_Jipa]

Hello, anyone that still comes here! I suddenly got the urge to play this great classic again, and I'm almost completely through. I have done and collected just about everything possible in this game, but I'm stuck at 98.39%. I got all of the weapon trophies, all the spells, and all of the enemy trophies except for that damn last boss. I unlocked the final boss's chamber and opened it, but that still doesn't add the last boss trophy, so I'm not sure what I have to do to get full completion in the library. I also showed the Ancient Relic to Master Torix and got all of the rare drops (I think?), including the Dragon Boots. Do those boots show up anywhere in the Library? Because I don't think I've seen them.

I'm finally so very close to truly beating this game, but I'm not sure what else to do. Any help is greatly appreciated!