I tried comparing achievements, going offline, powering off the console for 24 hrs, etc and nothing seemed to work. I'd also left the console and game on for hours with no result. However, last Thursday eve I left the game on where you select the multiplayer mode for 2-3 hours and the achievements that were blocked got unlocked. It took AGES to get here, but finally here.
Definitely an issue with the game as I play a LOT of games on the Xbox 360 and Xbox One, and this is the ONLY time and game this has happened with.
Thanks to all those who tried to help. I appreciate your support and efforts :-)
