Here's a neat idea. So Nintendo is obviously still not jumping onto the achievements bandwagon, and still not committing to a full-on online experience per Nintendo itself. So why not announce a huge partnership with Steam, EA, Battle.net?
You end up letting the market decide, and you kill two birds with one stone. All "achievements" could be acquired through a Wii U Steam/EA/Battle client, and all those accomplishments could all be synced together and sorted on the U's "Gamercard" in the dash or what have you. It could handle friends, chat, text, even browser capability far more streamlined than 360/PS3, especially on the tablet. You set up one Wii U account, and upon creating a first time game save it auto-creates a add-on for whatever is supporting it like Steam. It also takes care of online play, and even cloud saving and possibly awesome deals and Indie support.
Not only that, but if we see something like Steam integration/support, developers of older games (VC/Wii) can retroactively go and add achievement support for older games or revitalize online play. It's a win, win for everybody.
You guy's see any real potential issues with this scenario, assuming the syncing and sorting isn't micro-management like and more or less invisible?