When accomplishing some task in Super Smash Bros. for Wii U, great or small, you will sometimes be congratulated with a message on the screen indicating that you've achieved some Milestone in your progress through the game.
All of the Milestones possible to encounter in the 3DS version of the game have been documented on the internet. However, the Milestones for the Wii U version are lacking. There would be some overlap, of course, but there are differences.
What are the Milestones possible to encounter in the Wii U version of the game?