Heya Reika, got some feedback for ya today! You know how we have various achievements to guide us through various steps of the mod, which then unlock research and such through the fragments? I've been working my way down as best as I can (got the old world restored and fully functioning, for what it's worth), and just unlocked the achievement for 'static skies are empty', referring to the other boss we all know and love/hate. The problem, of course, is that I already killed said boss some time ago, at the same tier of achievements where it asks 'surely there can't be anything weirder than the land of flying jellyfish'. After all, I can't really get back home until I kill that boss, which presents a problem in that now I can't clear this achievement further down. Furthermore, I also have Hardcore Ender Expansion installed which changes said boss, potentially not allowing the achievement to clear. That's just guessing however, for all I know you've accounted for that possibility. Now granted, I can regenerate my End (for the third time now, heh) specifically to kill the boss yet again, but it's certainly an irritation.
Should the boss kill achieve be tied to the same tier as the exploration achieve for that dimension? I feel like it should, if only because I usually don't bother to kill the Wither until such time as I need a Nether Star, which is pretty late in my own progression typically. Any thoughts on it? Do I need to regenerate the End again for this one? Will it even work with HEE installed? Thanks for your time, Reika.