User blog comment:Bobbricks123/New Glow System?/@comment-25637747-20150123193749/@comment-25257441-20150123194305

I would say that now, when you get the 5 Achievements, you get the Green Glow, and if you get 11 Achievements, you get the Blue One.

Though, I couldn't tell what you could get if you complete the 16 Achievements...