I have just linked my Steam version of AoE4 to my Microsoft / Xbox account (the one I am posting from here), and the Steam version of the game suddenly says that I have earned a few new achievements. Some of them seem plausible, but I would have earned them a while ago, so not sure why they all popped up on the screen immediately after linking.
However one in particular is definitely wrong:
"Record Breaker" - Earn a gold medal in 5 Art of War challenges. I only have one Art of War gold medal, 1 silver, and 1 bronze so far, so this is wrong. Maybe it is including gold medals from Age of Empires II:DE art of war missions, which are also linked with my Xbox account?
This is only a very minor issue, but reporting it as I haven’t seen anyone else report it yet.