Achievements not unlocking for Backwards Compatibility Games

I have the exact same issue. I can't unlock any achievements on Xbox One games. However I can unlock achievements on Xbox 360 backwards compatible games.

Couldn't you just automatically unlock the achievement for players that have the game? It's ridiculous to have any achievements locked behind shutdown servers or apps. That goes for all games that have been made backwards compatible..

That game is not backwards compatible due to there being a Xbox one version. If you would like to play it on the xbox one and unlock the achievement. Look out for sales. That game seems to go on sale pretty often.

Xbox 360 games played on the original system itself don’t require an active broadband connection to unlock achievements, unlike Xbox One’s backwards compatibility. Unfortunately your account maybe under a temporary suspension or you didn’t meet the
requirement for the achievement itself

Factory reset is done, now I cannot sign in to Xbox Live from the 360 emulator. I am online with the Xbox 1, playing multiplayer and watching netflix, connection test shows that everything is working.

When I open 360 games, my gamertag pops up as signed in, but not connected to Live.