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