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.