First take out the turrets on it's legs and proceed to the top.Then destroy the 2 yellow key guards and get two of the eleven crystals you need. Then head to the door on the left and take the blue key out and take the two other crystals with you.After that go to the door on the right and take the final red key and the next two crystals.Finally go to it's head, open the doors and collect the remaining crystals and then your done.
