Support and instead of doing a challenge and never being able to do it again there should just be a cool down. This idea is very visually intreging and looks better that the current way of seeing challenges.
I believe @TannerLittle used a old plugin and just configured it (Don't quote me on this) and yea, I play skyblock or started to recently to explore the Game-Modes community and yea we should definitely add some more achievements and I don't think it is necessary for a GUI System to be added to the Achievements but if needed/demanded a lot Support