So this is weird to me. In all my years of being on steam there has been one pattern that's been consistent throughout: starting achievements do not get 100%, it's usually less than that, unless its one of those "games" where you buy cheap to get easy cheevos. I think the highest I've ever seen was 70% or something for starting steam achievements - that was Elden Ring, one of *the* most popular games on steam:
On top of this, the game has been out for only a few hours but the end game achievements have a percentage competition. This doesn't make sense to me nor does it appeal to my experience of being on steam. To contrast, Elden Ring had 0% on end game steam achievements and didn't increase until days later.
Pictures of Veilguard's Steam achievement completion:
End game steam achievements: