Simply advance to the end of the aqueduct to find the Gorgon Eye.
When you hit the water, dive down and to the right to find another secret passageway. Swim to the end and emerge on dry land to find the next Feather and Gorgon Eye.
At the end of the swimming section, emerge onto the docks and go left to get the chests containing the Phoenix Feather and Gorgon Eye.
Go through the gate and take the first left to get the Phoenix Feather chest.
Once you’ve solved the mechanism puzzle in this room (pop the hanging guy into the torture coffin and haul the other dead body up in the lift to toss off the edge onto the pressure switch), hop across to the right side of the room and grab the Gorgon Eye from the chest.
After a close call with a giant tentacle, climb the ledge, head left and climb the platform at the end to nab the last Phoenix Feather and the Light as a Feather trophy.
Beginning from the same ledge as above, take the path around to the right to find the last Gorgon Eye and unlock the trophy The Eyes have it.
It would be remiss not to point out the locations of the last 2 white chests in this area.After freeing the giant gear up on the right, use the magic of the amulet to restore the massive chain to its prior glory and pull the lever in the floor to the left. Have the moveable stack of cogs placed in front of the mechanism on the left so that you can dash over and shove it into the gap as the gear turns to bring it grinding to a halt. Now you can scale the left side and jump onto a wide ledge holding the last 2 white chests in this area.