Xbox One Achievements Can Evolve Over Time

Xbox One Achievements will have the ability to grow and change over time

Following the reveal of the Xbox One, hardware leads from Microsoft mentioned how the fluid, cloud-based nature of the new console opens the door for games and experiences to evolve over time, including Achievements themselves.

They cited the zeitgeist surrounding Skyrim's "Arrow in the Knee" meme as an example of how this evolution could happen. On the Xbox One, Bethesda could have gone into the game and specifically created new challenges and rewards based around the online joke.