Complete each requirement to receive the achievements.

Unlockable             How to Unlock
-------------------------------------------
Charming infiltrator - Completed chapter 4.
Genius!              - 50 puzzles completed without using hints.
Jailbreak            - Completed chapter 2.
King of the hood     - Completed chapter 3.
Love is in the air   - Sara rescued.
Mastermind           - 50 puzzles completed.
Mission bound        - Completed chapter 1.
Promising student    - Completed the tutorial.
Sleuth               - Completed game story.
Training day         - Earned a hint key on each of the six brain 
                       training exercices.