"To All the Squirrels Through Time and Space" is showing as incomplete in all the things even though according to the pop up its complete.

have you opened your achievement window (Y)?

have you opened your achievement window (Y)?

yes

have you shift+left-clicked somewhere in an ATT list or on the minimap button? opening your achievement pane should have cached your known achievements, but maybe refreshing will help. if that doesn't work and you use unique mode, you can try toggling completionist on and repeating those steps (opening achievement pane + refreshing).

derp wrong character