Item description:

Go into the room on the left

Continue down the stairs/steps

Kill the 2 mummies

Pick up the treasure to earn the trophy, Ice Guardians


Proceed with the game and go out through the other door

There will be a cutscene with Stein

Just go cover to cover making your way in front of the platform
(wait until Stein is reloading for you to move to the next cover)

Watch out for nearby enemies on the ground

Once you're at the front of the platform, pull the lever,
and climb up the ladder, Hit X and then R2 (for QTE)

You will earn the trophy, Wolf And Stein