Here is the full list of all 14 What Are You Stupid achievements.
Meet the Visitor
Earn grade A on Visitor
Earn A grade on Librarian
Clear My House
Clear Uncle Ron's house
Clear Uncle Judd's house
Clear Grandpa's house
Clear the game
Earn A grade on all characters
Check out all rewards
Defeat Librarian
Thank you for buying this game
Defeat your Dad
Earn grade A against Dad