Didn't see a guide for this one, so here is the way to get this one:
This occurs in Dawnvessel.
First you need to release the Sunfish - when the Architect tells you to dive into the whirlpool - this will release the Sunfish.
Next you need to enter into the Sunfish: just enter into its orb and break free by pressing buttons on your controller. This will release a bunch of blue orbs into the water that act as perches.
Next you need to shoot from these blue orbs using LB through the Sunfish a few times (it took me 3 passes). The Sunfish will once again have the orb on it that you got stuck in the first time.
Shoot from one of the blue orbs into the Sunfish orb to be captured again. Break free by pressing buttons and a cutscene will start up and the achievement will unlock.