Here is the full list of all 22 School Sweets Discovery ～granulated sugar edition～ achievements.
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Played story mode
Played the story to the end
I saw BADEND
I saw GOOD END
I saw TRUE END
I saw two kinds of endings
I saw 3 different endings
Played challenge mode
Played challenge mode to the end
Correctly answered 4 or more questions in challenge mode
Correctly answered 10 or more questions in challenge mode
Correctly answered 16 or more questions in challenge mode
Correctly answered 19 or more questions in challenge mode
Select Tsukasa and answer 22 times in a row
Select Himeka and answer 22 times in a row
Play the voice with the character description in the picture book (Click the character)
Collected 6 types of pictorial books
Collected all kinds of pictorial books
I saw all the pictorial books and endings
A total of 222 questions were answered correctly
Acquired all achievements