This is the route I take.

This does not list all the Gold Bracket Bosses but lists the important ones. As you proceed through the map clear out Gold Bracket Bosses first and skip the Silver Brackets, or take them out as your running past them.

Step 1 - Enter the base and take out the Gold Bracket straight ahead.
Step 2 - Clear out the Gold Bracket on your way to the Elevator at the end of the corridors. Take the Elevator.
Step 3 - Clear out the Gold Brackets on your way to the first T, go left and take out the Gold Bracket heading toward the Grotto.
Step 4 - Turn around and head toward the Medical Centre.
Step 5 - Destroy Medical Supplies and Gold Brackets in the Medical Centre before proceeding to the Cantina.
Step 6 - Clear out the Gold Brackets in the Cantina and take the Elevator to the Storage Room.
Step 7 - Clear out the Gold Brackets from the Storage Room
Step 8 - Go left out of the Elevator toward the Tunnels to the Hanger take out the Gold Bracket in the hallway before the T in the Tunnel.
Step 9 - Turn around and head toward the Command Centre, you will pass the Grotto on your right.
Step 10 - Clear out all Rebels on the way to the Command Centre Elevator.
Step 11 - Take the Command Centre Elevator and clear out the Command Centre, Destroy the Bombs.
Step 12 - Use the Command Centre Elevator again and make your way to the Grotto. (Depending on how fast your moving the Grotto may already be getting cleared since Step 3).
Step 13 - Destroy the Food Crates in the Grotto, head up the ramp straight ahead and head toward the Hanger. (If you cleared out the Gold Bracket in Step 8, there will be storm troopers preventing the Rebels from escaping with the Food Crates at the T in the Tunnel).
Step 14 - Clear out the Gold Brackets in the Upper Hanger and proceed to the Elevator on your left when you entered this room. (Lord Vader should be coming out of this lift).
Step 15 - Take the Elevator down from the Upper Hanger to the Lower Hanger and proceed to the Equipment Room.
Step 16 - Clear the room of all Rebels and Equipment Crates.
Step 17 - Head back to the Lower Hanger Elevator and go up twice to access Phase 3*.

*If Phase 3 has not started you cannot use the Elevator to go up from the Upper Hanger, go back to the locations where there was Objectives to Destroy and make sure they are all destroyed.