The first level completion achievement only shows 28.9% have completed it... that's barely more than 2 in 7 owners. The later level completion achievements are even more depressing, albeit I suppose a drop-off due to that freaking bird could be understandable (I laughed when I first saw him struck by lightning, and grinned when I saw his corpse as part of From the Sky to the Abyss). I'm guessing that there's a discrepency due to the game not having achievements when it first came out, but even with that... I don't mind say Hold Your Breath being epic-rare (YES! I'm in an elite 0.6% for something! lol) but yeah the basic level completion ones really seem like they should be more common. Is anyone else disappointed with the achievement completion stats?

New to this platform. Where do I even find the achievements?

In Gog Galaxy go to the game page in your library, and achievements will be there.

As to the % of achievements. I bet there are alot of gamers like me who have about 4X as many games as we'll ever play.

I just finished RiME and really enjoyed it.

Achievements not working as RIME is not starting on GOG Galaxy.

IYes, i am tryng to get all Achievement, but no one is working, so sad.

I recently finished it with 100% completion rate and can assure all those those achievements are (currently) perfectly reachable. But yes, indeed, some of them feel quite counter-intuitive - I certainly would have thought about "Hold Your Breath" if I hadn't red about it online. Come on ! Who would try to do such a thing naturally ^^ ? - and will most certainly require several playthrough or at least retries (through the "Chapters" menu once you've finished the game once).
That said, yes, I agree : "0,6%" seems a tad low for something which takes (at worst) 10-15 minutes of your time... As Fartheststar implied, I guess lots of players don't really care about completion rate and didn't spend much time searching for those achievements (even with some online help).