You cannot get 121 stars in Super Mario 64. You can accomplish every level; get every star (including the ones in the Bowser levels), but if you get the last star (by defeating Bowswer) it won't count for your total.
There are only 120.
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Collect all 120 stars and go to the cannon outside. If you are playing super Mario 64 ds get all 150 stars and go to the cannon outside.
Get all 150 stars
In the Nintendo 64 version you need 70 stars. In the DS version you need 80 stars.
No,it is impossible to get Waluigi in Super Mario 64 and Super Mario 64 DS.
Collect 16 Stars, then it appears in the foyer.