There is 1 Dead Ghost to be found in Trenchworks. They can be collected on any mission or during a patrol. Each Ghost can only be collected once per account.
Ghost 1[edit]
This is easiest to just access from the Iron Line nearby its Dead Ghost. Head over to the left, down the slope. This is taking you away from the gate. Instead, go through the massive door here:
Head through the door. Follow hallway on through to the second door. Go on through that door as well. Head outside from the door.
Turn to the right and jump onto the marked rock.
Look between the rock wall and the rock itself. Toward the end of it you will find the Dead Ghost:
