In Act 2: "A Spirit From The Vasty Deep", you have to repair three
attractions in the second act. One of the attractions is the Pirate
Ride. After solving the first puzzle, you will get in one of the boats.
The boat will stop after a cutscene, and a tentacle will block your way.
In the same room is the treasure chest. It will keep opening and closing
quickly. Go up the ramp next to the chest, and jump inside to get the
"No Backpack Bird Needed" trophy.