Octodad: Dadliest Catch/The Deep Sea

From the Aquatic Fun Center hub, call the elevator to enter the Deep Dark Sea area and find Stacy. Turn the first spotlight to the left toward the left-most poster, where a tie (1/3) can be found sitting at the bottom. Proceed down the path for the first achievement/trophy opportunity here, though it's a tricky one: you must move around the dance floor without missing a step. If the light on a tile fades before you can reach it, you'll have to reload the checkpoint and start over. The order that you step on the tiles doesn't matter, so long as you hit them all. After completing the game, grab the shake light ahead to proceed down the dark corridor.

Eventually, you should come across a marine biologist standing by an escalator. Take a left instead of approaching him and shake the light by tank to reveal some special jellyfish, earning another achievement/trophy. As you approach the marine biologist, Stacy will take the shake light and distract him. Sneak up the escalator to find yourself in a large open space. Walk toward the maintenance area and Stacy will eventually follow with the light. Take apart the middle crate to the left to find a tie (2/3) inside. At the back of the room, plug the cords into the corresponding sockets (orange in the back-left, blue back-right, green front-right, and red front-left). Then, turn the spotlights so that they shine on the part of the fish display labeled with the same number (1 to the left eye, 2 to the right eye, and 3 to the center).

Once the fish is lit up, climb it by stepping into its open mouth with one of Octodad's legs, and rounding the other leg onto the fish's lips. At the top of the fish is a tie (3/3). Proceed toward the exit to come across two escalators that are moving in the wrong direction. For the last achievement/trophy of the stage, Octodad will have to rush up two sets of escalators in 30 seconds, and press the button at the top of each so that they move in the right direction for Stacy. If you don't manage to accomplish this, you can always reload the checkpoint to try again.

After exiting, Octodad will end up back in the hub of the Aquatic Fun Center. Proceed up the stairs to the employee only area; on the way to the top of the tank, stop in the locker room area. In a locker to the left is a tie (3/3) that acts as the last for the ../Aquatic Fun Center/ stage. Approach Scarlet to trigger a scene that leads into the next stage.