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