About being for bragging rights, sorry, didn't mean you. Rather, to me it seems to be the common mentality, even if not usually worded like that. And for DRM, I consider as being as such because the player doesn't control the content, even if it's just a part of the whole package or a mod.
About integration of in-game achievements, solutions I see are usually lists or the sort in menu entries (e.g. Dust: An Elysian's Tail where achievements are an entry in the start menu), or the addition of an extra area that doesn't break the style of the game (e.g. FFVI T-Edition where the trophy room is added to the tutorial building). Also some in-game achievement screens can look rather nice, like (imo) FFXII's.
As for a curated list, taking inspiration from a thread for GOG's titles with in-game achievements, maybe either of us could make a similar one for emulated games here on the fediverse?