Stackable Achievement Groups

Would be great if we could create stackable achievement groups.
A great example would be "Member for 1, 2, 3, 4, 5, 6.... years"
So they either replace the prior achievement entirely, or they visualy stack/layer on top of each other.

Also, the achievement icons should be enlarged in the "Badges" overview when visiting a profile.
The numbers are way too small to be in the readable spectrum for many human beings.