Seems to be a pretty solid complete list (though I didn’t go through my forza links because… boring 
) I think some of those might be new enough that they could be coming soon (ever the optimist lol) but yeah, most have been around for ages or from the start.
However, isn’t the Sombrero the Limited Edition Controller exclusive ?
EDIT :
And more important When, where, and how did I miss picking up Jackets - Spaik Short Sleeved Shirt !
AHA ! There it is (was 
) Nov. 18th-25th
Wonder how I missed it ? Or I didn’t miss it but it never got awarded ? Not sure at this point.
Forzathon Shop for 75 FP ? I’d say it’s impossible I missed it there but maybe aliens abducted me ?