Xbox 360 gamerscore not showing on Xbox one - Microsoft Community

Xbox achievement issue seems to be back following Microsoft's fix

Everything You Need to Know About Xbox Achievements

Achievement notifications not showing up. - Microsoft Community

Earn 10,000 Microsoft Rewards Points for 10,000 Gamerscore in May [updated]

My friends did a competition for gamerscore this month. How tf is this possible and how would you recommend I join next month? : r/xboxone

Gamerscores and Achievements carry over from Xbox 360 to Xbox One

Messaging in Xbox Live - No Email, No Spam - Xbox 360 - Up Close & Personal with Live, the Console and the Wireless Controller

Battle your enemies with incredible superhuman powers - like the deadly bladed glaive - that evolve and become more powerful throughout the game

Dark Sector - Xbox 360

Microsoft Rewards balance to be displayed alongside Gamerscore on Xbox

Add me on here if your an active player. I play the shit out of my 360 I want more people to play with whatever is still online. : r/xbox360

Many Thanks for One Year with Xbox One - Xbox Wire

My Xbox Live isn't working although I've paid for it. Why is this happening? - Quora