Subnautica has been added (X1 only)
PC version of Dead by Daylight has been added (already on X1)
PC version of Metro 2033 Redux has been added (already on X1)
Metro was never mentioned so this was kinda surprising.
I also missed that MS already gave a release date for Age of Empires 2 Definitive Edition, it's November 14th and the achievement list is already out: