Sorry if this has been said, I had a quick look and couldn't see anything!
It would be nice to be able to toggle those pesky retired achievements on or off depending if you want to see them when viewing the achievements list. It's really annoying looking at achievements and getting all of them in a list with some retired ones halfway through the list.
God, yes please. Or a way to sort them all to the bottom/last page.
I agree, they could probably just have their own separate section "Retired" and once an achievement gets retired just stick it in there. That way you can see all of them at once if you want and they don't take up space in the other lists when you're trying to see which achievements you still need that are actually feasible.
I'm not sure how feasible a toggle would be but I definitely support it, or moving them somewhere separate, or something
I support something being done about them. It's really frustrating.

In favour of this.