For this Achievement, you will want to load up
chapter 30 (The 30th dot on the load screen)
Once the level begins, you want to
head to the left and down a little.
You will see some light escaping out of a hole below you. Now, you want to
go to the right of the object blocking your path and hold and push , now release and you will push the object out of the way. Now you want to head down and
follow the path until your find the collectible. You want to
head up the ladder and
jump into the control headset, and use this to control the other person.
Once you have control of the other person, put him on top of your submarine, then hop off the headset.
Head back to your submarine and you want to
move underneath the other headset. You now want to
jump your submarine out of the water using "Hold
" technique and aiming upwards (
)
Keep jumping up until his head attaches to the headset. Now
head back to the first headset and take control of the other person, who will now be in control of the 3rd person in the room. You want to simply
walk to the left and hold & to pull on the collectible and
pop goes the Achievement!