Seasoned Veteran Achievement in Forza Horizon 5

If you hit start you'll see Festival Playlist on the main campaign tab. If you head inside there you'll see a whole host of seasonal activities to get involved in. Basically, do one of those in each season and you'll get this achievement. So yeah, considering the playlist seasons only update every week, this one will take a while. Not in terms of duration and effort, but in terms of time. Just make sure you at least dip in once a week to do your event - and get some Forza Points in the interim too!