This may seem silly, but I prefer the way the Xbox 360 ordered your games in the Achievements list by order last played. The Xbox One Achievement app should go this route if they are only going to have one option, but the best solution would be to have different sort filters with the option to set your default one. Sorting them according to the date the last achievement was unlocked is ridiculous. Also, I don't know that there is a way to compare your whole list of games/achievements to your friends' list like on Xbox 360.
Hopefully the November NXE for Xbox One will address some of these issues.