Xbox 360 saves carry over via Xbox One’s back compatibility service
You will be able to pick up your progress in Xbox 360 games when playing on Xbox One, Microsoft has confirmed to Eurogamer.
Gamerscore progress will also carry over, allowing you to continue working on unlocking Achievements even though you are playing on Microsoft’s newer console.
These new features were not detailed in the company’s press conference, but were confirmed to Eurogamer afterwards by Microsoft executive Kudo Tsunoda.
“The achievements carry over for sure,” Tsunoda said, explaining that this was because Xbox Live treats your Xbox One copy as if it were the original Xbox 360 game.