Halo 3 Backwards compatable glitch

So, I am playing halo 3 on Xbox one, yeah I know why don’t I just play it on MCC (answer is armor customization and nostalgia), well anyways… So I’ve been running through campaign and multiplayer achievement hunting and finding skulls, I’ve noticed a few problems though… Well, for starters there is a few achievements that no matter how many times I save and reload, completely reload the level, or just just do anything for that matter it will not appear in my achievements, and to anyone who knows, is holding me back from hyabusa/katana. Now the glitch with the skulls, so I’ve noticed the skull at the start of the first mission, and the birthday grunt skull both will not register that I have picked them up, yet every other skull I have obtained so far work fine. Is this a common glitch? And is there any way to fix it?