episteme on 08 March 2014
They should combine trophies with stamps.
A first step could be a list of all unlocked stamps on the Miiverse profile page that others can see. Or a page that summarizes all posts with the accomplishment tag.
Deus Ex has some automated achievement posts on Miiverse.
It's not as good as a real trophy system, but it already has some simple things that can be improved in the future.
