Mission 8: Rampart

3 Dog Tags
2 Audio Logs
Once the mission starts, continue along the hallway then enter the door to the left. Then, enter the next door to the right to find an audio log in a small room.
Queen Recording

Open the next door, continue downstairs and the elevator up. Follow the corridor until it gives way. Follow the path and ignore the queen thrashing about in her containment cell. Take the next set of stairs down and open the next set of doors until you exit out of the facility. Kill the PMCs and xenos there and move forth.

Continue fighting a few more enemies until you reach another building. Before continuing along the path to the left (leading towards to the derelict alien ship), enter the building to the right and look for a dog tag on top of supply cache by the wall to the right.
Outpost Dog Tag

Proceed along the path and clear the enemies in the area. Continue ahead to enter the derelict ship. Make your way to the first research outpost inside. Kill the personnel inside then check the first room to the right to find the last audio log there.

Origin

Continue fighting your way to reach the elevator. Go up and clear the hallways until you find the “maker's” remains. Go around it and check the floor at the end of the catwalk to the right, near the remains. You'll find the mission's second dog tag there.
Maker Dog Tag

Clear the area and the next hallway until you reach outside. Kill the xenos and PMCs along the way and continue forth. Once you see the path branch to the left, follow it first and head towards the lift. You'll find the last dog tag on a crate beside the lift.
Lift Dog Tag

Fight your way inside the facility and start clearing it out as well. Make your way outside and kill the guards to rescue the prisoner and complete the mission.