Xbox One won't automatically record footage of you unlocking an Achievement. Rather, it's a feature developers can enable, if they wish.
Microsoft moved to correct reports that suggested the next-gen console would automatically record all Achievement unlocks. Director of product planning Albert Panello took to NeoGAF to clarify.
"It won't be automatic for every Achievement," he said. "It's a feature that Developers can unlock for achievements, OR, for instance, have hidden in the game for doing something cool or discovering something hidden. Basically we allow developers access to GameDVR and they can put conditions on an automatic recording.
"But not every Achievement will automatically be recorded."
This is how it works: developers can mark "greatest clips" that happen within the game, such as when you unlock an Achievement. Alternatively, gamers can use their voice or the controller to capture moments they'd like to record.
Either way, you should be covered when it comes to video capture: Xbox One automatically records the last five minutes of your gameplay. Using Upload Studio you can edit the footage, add titles, a voice-over or extra footage recorded using Kinect.
Microsoft has confirmed that at launch Upload Studio will be limited to sharing video on Xbox Live, but the plan is to roll this out to the likes of YouTube next year.