I'm most active in the Physics SE. As you might now, there we still have the old profile page, so we don't have the 'next badge' progress bar.
Or at least, we didn't have the progress bar until last week. Now it's visible at the bottom of the new Achievements Dialog. Good, but... there is no way to change the target badge!
In the sites with the new profile page (I've tried in WorldBuilding SE), you can click the gear icon next to the progress bar and change to your favourite badge. Then, the badge in the Achievemnts Dialog changes accordingly. But in Physics SE, no new profile page means no gear button. :(
Can this be changed in order to make the bahaviour of the old-profile-sites more consistent? I don't know what would the best option (a 'gear icon' in dialog/removing the badge progress bar/other ideas), but in the current form, it's basically useless.