https://steamcommunity.com/stats/2556990/achievements/
This is one of those games I’d have bought full price at launch but the lack of basic Steam features was enough to turn me away.
It seems that (perhaps yesterday?) they just added Steam Achievements, plus the game is discounted to $12.99 at the time of writing. I didn’t see any news posted about it.
It still has the burden of an extra login account via Ubisoft Connect, which perhaps shouldn’t come as a surprise at this point.
Side note: Ubi is very inconsistent with their releases. Prince of Persia: The Lost Crown released on Steam today and it has achievements day one. Meanwhile Assassin’s Creed Valhalla and other games never got them.