Überkommandant Mission: Riverside
These six additional Collectibles can only be found in the secret mission unlocked by defeating the first 15 Überkommandants.
C48: Shooting Range, Hangar, and Moon Pool
Basement Level 1, in the subway station near where you begin the mission.
C49: The Ausmerzer
Basement Level 3, in the second part of the level, in a dead-end room.
C50: The End
Basement Level 4, in a control room.
G49: Ausmerzer
Basement Level 1, at one end of a short corridor. Requires the Battle Walkers. Go to the far end of Basement Level 2 and look for alcoves that dead-end. Look up to see an opening—reach it with the Battle Walkers.
S75: Jerry Gussom
Ground floor, in the area where you find the Überkommandant, inside the wrecked automobile.
G50: Zerstörer
Basement Level 5. Requires the Ram Shackles and the Battle Walkers. This one’s tough to collect. Crawl through a duct on Basement Level 4, located in the hallway between the large room and the control rooms. Follow it and drop to Basement Level 5. Use the Ram Shackles to break through the barricade, then drop to a lower area and use the Battle Walkers to get back up on the other side.