A new Achievement App is heading to Xbox One, and it's coming later this year, according to an announcement made before Microsoft's E3 press conference.
You'll be able to use Achievements in Snap Mode, which is great if you don't want to jump in and out of the dashboard as you're playing. Different challenges can be sorted by how close you are to unlocking them, and they unlock in real-time.
They'll be sortable, so you can put the important ones at the top of the page. Finally, you can also get help with Achievements you're struggling with, via hints and tips from the web.