Hello Horse Adventurers!
With this update, we fixed a bug that prevented Steam achievements from being unlocked.
All achievements should now work again.
To trigger achievements that you already unlocked, but that were not displayed in Steam, you can complete any race in the game - since that is where the savegame gets updated - and it should work.
If problems persist, hop over to the discussions in the Community Hub, and we will have a look.
Best,
your KORION-Team!