I don't personally own a Wii (at one time, I did), but I think it's rather unfortunate (however understandable) that there are no 'trophies' or 'achievements' awarded in their titles, especially their download collection of older classics.
Looking at one game in particular, that being Legend of Zelda: Link to the Past, if the achievements were left up to me - this is how I would list them (using a standard like say XBLA's 200/200).
Locate the secret entrance to Hyrule Castle (10p)
Successfully deliver the Princess of Hyrule to the Sanctuary (10p)
Maximize your Bombs and Arrows (10p)
Find all of the Bottles (10p)
Whack the chickens until they swarm you like killer bees (10p)
Obtain the Red Boomerang (10p)
Collect 999 rupees (10p)
Collect all three Pendants of Virtue (10p)
Acquire the Master Sword (10p)
Rescue and free the Seven Maidens (10p)
Defeat the evil wizard Gannon, completing your quest (10p)
Locate the secret room of Chris Houlihan (10p)
Complete the game without collecting a single quarter heart piece (20p)
Defeat the evil wizard Gannon without taking any damage (30p)
Find all of the quarter heart pieces (30p)
Is there anything I should have included? Anything I missed? Anything you would have done differently?