Been playing FM3 lately to finish it out and get that next tier. Made a ton of achievements offline thinking that they would sync next time I was connected to WIFI, no dice. Are these lost forever?
You will have the achievements on XBox Live - what the Forza Rewards programs sees though may be very different. The Rewards system is broken and it is anyone’s guess as to if it will ever be fixed properly (rather than a bandaid fix which is all we keep getting).