This comes straight from Jackson over at 5th Cell...
There are no Wii U accomplishments that are system wide. They are up to the developers to include or not include. 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 area specific.
There you go, now we know with 100% accuracy. No system-wide accomplishments on the system. Is that a deal breaker for you? Thanks to Dim for the heads up.