On a side note, and while we ultimately don't have an answer on this yet (so go ahead and discard this if it doesn't come true), some people misunderstand the value of achievements/trophies. I'm not a hunter myself (even though I ocassionally love going for that 1000/1000 - Platinum, depending on the game), but these things not only provide another element of interactivity within the game (totally optional, so you don't really have to go for it if you don't want to), but also can further cement a strong, dedicated and social online infraestructure and community; something Nintendo really lacks (heck you have to download a freaking app for your mobile in order to do voice chat; Xbox Live already had implemented voice chat back in 2002).
Both inside and outside Nintendo's ecosystem, gamers could gather around this system. Just look at communities like Trueachievements or the likes. They have plenty of users that enjoy collecting achievements, competing against others and actively socialize. Same within the console, you could compare your games with another person or see the amount of progress he/she has made. Nintendo not including achievements is not just a small gimmick they chose to ignore, but a circumstancial evidence that they don't want to create in any way or shape a social ecosystem for Nintendo consoles (even worse now that Miiverse and the likes is being taken away).
And this wouldn't be so bad...but now then there's the fact that you will have to pay for online access past a certain point. An online access that basically covers a self-contained individual page (My Nintendo; though you don't necessarily have to pay to access this) and multiplayer. Achievements, at the very least, would be a way to start an ecosystem that's now behind a paywall, but the way it is right now, there's nothing.