Here is the full list of all 14 What Are You Stupid achievements.
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Defeat your Dad
Earn grade A against Dad
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
Meet the Visitor
Earn grade A on Visitor
Defeat Librarian
Earn A grade on Librarian