To unlock this achievement, you need to deactivate the 7th orb. To find it quickly, load the 32nd checkpoint (on the beach in front of a door). Instead of opening up the door on your right, go back left in the submarine and keep going left. When you see a a structure with an unreachable ladder, charge 2 times on it with the submarine to destroy the structure and climb up the ladder (to find the orb). Watch the video below:
A Tableau achievement:Full walkthrough of the game: