Here is the full list of all 43 The Academy: The First Riddle achievements.
Take a picture of a pinecone on a tree
Finish the game using no hints
Solve all the paper puzzles
Take pictures of all blue birds
Take pictures of all the graffiti
Make time for a study session every day
Find 100 hints
Take a bath 3 days in a row
Re-watch the movie about the baron
Finish the game using less than 20 hints
Solve every book puzzle
Find the device
Take pictures of all the statues
Take pictures of all the butterflies
Find the sculpture
Solve all the puzzles
Finish the final exam
Save professor Wilson
Find 30 hints
Find the hidden safe
Solve 7 library book puzzles
Attend Self-defense class
Attend the Writing class
Play 3 arcade games
Flush the toilet and wash your hands afterwards!
Take a bath
Solve 50 puzzles
Attend photography class
Get 5 wrong answers in class
Take pictures of all your colleagues
Finish 10 sidequests
Attend the First Aid class
Solve 3 paper puzzles
Get 5 right answers in class
Talk to every classmate
Find 10 hints
Take 3 pictures with the camera
Solve 15 puzzles
Make time for a study session
Attend the Painting class
Solve 5 puzzles
Solve a puzzle in less than a minute
Finish the entrance exam