The real purpose of 'achievements' are to increase the replayability of a game imo, the only reason I am currently playing Super Mario Land 3DS is to get 5 shiny stars next to my saved game; a bit sad i know but it makes the experience alot more fun.
If they want to go retro they should just call it the 'Super Wii' ala the Super Nintendo or scrap the wii name altogether and go with the SNES2.... I would crap my pants.