Look for a hatch on the wall. Use your Batclaw to pull it open, then use your Batclaw again to grab the trophy.
STEEL MILL RIDDLER TROPHY #12
you enter the Assembly Line from the southernmost entrance on the west
side, look up and to your left. There is a ledge above the vent that you
can grapple too. Once you have, use your explosive gel to destroy the structural weakness.
STEEL MILL RIDDLER TROPHY #13
Step out into the main room and use your remote electrical charge on the generator. This will pull all of the carts towards the generator, revealing an opening. Use your freeze blast to stop the steam then crawl in to find your trophy.
STEEL MILL RIDDLER TROPHY #14
There is a vent cover in the same room as the generator used in #13. Pry it open and crawl through to find your next trophy.
STEEL MILL RIDDLER TROPHY #15
Hack this console using your cryptographic sequencer to open the elevator door, granting access to the trophy.
STEEL MILL RIDDLER TROPHY #16
Crawl under the floor grates and look for this pipe spewing steam. Close it off with your freeze blast, then climb past it to find a trophy.
STEEL MILL RIDDLER TROPHY #17
Use your remote electrical charge
on the generator in this room, pushing and pulling the crane hook until
it smashes into the fan on the back wall. Just beyond that fan you’ll
find a trophy.
STEEL MILL RIDDLER TROPHY #18
through the area under the floor grates and head south until you reach
the spot where you first entered the steel mill near the start of the
game. Look for a hatch that can be pulled open with the Batclaw.
STEEL MILL RIDDLER TROPHY #19
Continue through the vent you opened up during #17 and drop down into the hole you find. From there, use your line launcher to reach the Riddler panel. Simply standing on it will open the trophy cage.
STEEL MILL RIDDLER TROPHY #20
Just to the left of the freight elevators is a hatch that can be pulled open with your Batclaw. Do so to find a trophy.
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