Here is the full list of all 19 Sixth Grade Detective achievements.
Figure out the identity of your secret admirer before the dance.
Get some fingerprint powder.
Help Evan come clean about his makeover business.
Get a makeover.
Start multiple romances at the same time.
Play Swords and Sorcerors.
Start a romance.
Get a book on codes and ciphers.
Finish the game without attempting to blackmail anyone.
Finish the game without lying.
Buy your very own bike!
Find Red Lightning.
Follow the clues to your birthday present.
Destroy the mean notebook once and for all.
Get a pair of binoculars.
Find the source of the mean rumors.
Publish an article in the school newspaper.
Accuse the right person of stealing Shashi's books.
Find a bike.