Aside from the joy of completion and finding any extras in the games you play, Jeremiah Slaczka (creative director and co-founder of 5th Cell) has let the cat out of the bag on NeoGAF concerning the Wii U achievement system… or should we say, the lack thereof.
Slaczka explained that while there won’t be a universal achievement system on the device, Scribblenauts Unlimited (and thereby presumably other games from other developers) will have its own accomplishments for players in the game:
“There are no Wii U accomplishments that are system wide. Scribblenauts Unlimited loosely has them in the form of ‘Global Starite Shards’ which is like a giant checklist of global things to spawn and do in the game that aren’t specific.”
And while it’s fun for many players to strive for full completion of all aspects of the games they play, Wii U gamers will have to get used to not having a profile screen full of trophies and points to show off to others, and will need to rely on good old-fashioned, person-to-person bragging!