Here is the full list of all 9 Detective Grimoire achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Complete the game 100%
Complete the game
Get inside the tent
Draw a cute ghost in your notebook
Full suspicion on the culprit, none on anyone else
Finish speaking to the Little Girl
Read the letters on Remington's desk
Examine all the Boggy merchandise
Examine the crime scene