I think Miiverse was supposed to be Nintendo's social achievement system.  Personally, I don't care about achievements.  I know many people do because they feel they get more out of a game.  But, honestly, I think it is padding for the game.  Look, you beat the game...but can you beat this level without being seen?  Can you beat this level without taking damage?  
Honestly I don't care.  I don't need to brag to my friends how good I am with achievements.  
I don't want achievements.  I would rather have more actual game.  Or special levels with unique challenges...but not same content achievement stuff.
That being said, I know this is only my opinion and other gamers love achievements...so you should provide a system to make them for gamers.  Still, I do not believe any gamer will choose one version of a game over another because of achievements.