After observing the enemy arrival, detonate the charges when you're prompted. Once the ice above collapses, shoot all soldiers that will fall in the water. Follow your teammates to the surface and engage the panicking enemies. You can move behind the covers to flank them. However, it will be easier if you move to the left side and enter the building there. Flush the enemies inside then continue pushing forward towards the platform.
After clearing the area, regroup with your teammates and use the Ascender Gun to fire the ropes above and latch to the platform. After reaching the top, find cover and take out all immediate enemies in the vicinity.
Go upstairs and take out more enemies on the ledge to the right and the descending enemies from the stairs ahead. Once done, continue upstairs to Deck 2 and stack up by the door. Wait for your teammates to blow it open and continue upstairs. Let your team check the rooms individually then place a breaching charge on the double doors. The breach will be unsuccessful since the enemies will shoot the door instead. Throw a flash grenade inside and storm the room. Find the nearest cover and kill all enemies inside. Don't hesitate to use your grenades to flush out the enemies behind cover.
This is during the part where you'll attempt to breach the common room but you'll be pushed back by your teammate right before enemy gunfire shreds the door. You can only get this on Veteran difficulty. Fortunately, this achievement is exclusive only on this part of the mission so you can restart the checkpoint to retry without losing any progress. It is recommended to have a full stock of flash and frag grenades here. You'll have to rely on your allies to take the heat while you cower behind cover and shoot only when it is safe.
After the breaching charge gets blown, lob a flash grenade inside and immediate go prone behind the cover. You can spot the enemies and throw your grenades in their position to flush them out. You can use your gun but you have to accurately hit your targets otherwise you'll give away your position and you'll get hit instead. The trophy/achievement will be unlocked once you hear your teammate confirms that the room is clear.
After clearing the cafeteria, head to the next door as Merrrick subdues the foreman. There's also a Rorke File here.
After getting the Rorke file, wait until the foreman's handprint is scanned then operate the nearby console to shut down the platform's pressure regulators.
Exit the room and continue to the upper deck. Wait for the explosion then fight your way through waves of hostiles. You can flank them through the left loading bay or the room to the right. There are also explosive barrels ahead that you can deliberately shoot to take out multiple enemies at once. Stay in cover and make sure the area's clear before moving forth.
Continue inside then run through the catwalk. Two suffocating enemies will burst out from the door ahead so finish them off and continue inside. While inside the smoking room, walk while ducking to avoid suffocating yourself. Follow Hesh until you reach the top deck. Fight through the burning debris on your way to the command center. You'll encounter fierce enemy resistance near the command center as they're also backed up by two machine guns mounted on the balcony. Take cover and shoot at the gunners where they're not aiming at you to take them out.
Clear the remaining enemy forces and enter the command center. Remove the corpse from the console and operate it. You have to keep the pressure on green by using the left stick while the pumps are being overloaded. After successfully overloading the pumps, the whole platform will start going down. Follow your team mates as you make your escape then jump off the ledge to complete the mission.
