Grand Courtroom
Start heading left around the outside of the area and you'll see small sets of stairs leading up to platforms above the center of the room. As you pass these, look back at them and one of them will have Crimson Omen on it. Go up the stairs and the COG Tags should be at the top.
Halls of Judgment
You'll spend most of this section defending a piece of high ground in the middle of the map. From here, if you go down the large set of stairs, you'll see doors leading outside. Go out those doors, turn left and you'll find the COG Tags next to the sandbag barriers on the floor.
Terrace
At the end of this section, instead of going through the door, turn right. You'll find these COG Tags in a small corner next to a large pool of spattered blood.
North Entrance
To get these tags, you'll have to cross to the far side of the area and climb the stairs that the grubs were originally coming down. At the top of the stairs, turn left and walk along this top level. The COG Tags should be at the end on the right side.
Main Entrance
You'll enter a large foyer just before the end of this section. When you reach the bottom level, you should see a room on the right side that is open and has a Crimson Omen next to the door. The COG Tags are just to the right as you enter.
Great Staircase
When you get to the bottom level, you'll see your waypoint at the middle of the staircase to your right. Go past this and up the stairs at the end. Turn left and you should find the COG Tags behind the barrier blocking the next set of stairs up.
Plaza for the Tyran Dead
This COG Tag is near the outer edge of the area on the far side. Follow the outside around until you find the Crimson Omen and you should find the COG Tags on the ground just a little ways off of the wall.
