Xbox 360 achievements will not show up on the Xbox one?

Ca
- in Xbox
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I'm currently playing an Xbox 360 game on the Xbox one, now I have the problem that if I unlock achievements for this game that are not shown to me on the one and the gamerscore is not counted even though I have completed the success why could that be?

To

How long do you play on the Xbox360 because I have one, true to me there so that when I have completed all successes that they no longer displayed, hope could help

Ab

If you're playing an Xbox 360 game on Xbox One, make sure the Xbox 360 emulator is online as well. It sometimes happens that even though the Xbox One is already online, you have to log in again with your Xbox 360 account online. Only then does Xbox Live calculate the achievements, and the Gamerscore database is then synced.