In the previous section,
we obtained a RESPIRATOR that we can't use and sprinted back to the STAIRWELL.
Quick-save again if you like, since running down stairs is also super janky.
Keep your weapons holstered and try to alternate running with short sprints if you can coordinate it. If it's too difficult, run and jump down the longer flights, or just run. Any smooth movement is faster than slamming into a wall.
At the bottom, draw your weapon, run down the short corridor and through the doorway.
Kill 2 more soldiers (9-10) in the room with the 2 doors and gallery signs.
NOTE: If you followed the same route I did, you will now have 10 kills (not including the 2 museum guards at the beginning of the level) and will now enter the final area. If you avoided the 7th and 8th enemies earlier, you'll need to open the door on the right, re-enter the gallery with the glass case, shoot the mercenary lurking inside. Then sprint to the far end of the gallery with the glass case. Go through the VESTIBULE to the gallery on the left, opposite the Archaeological Dig sign, and kill the soldier there. (These will be your 9th and 10th soldiers.) Then run/sprint back through the VESTIBULE and the gallery with the glass case, to the door with the light above it.
Even if you've been frugal with your Desert Ranger ammo, you're probably about to run out. So you may want to switch to the V-packer before opening the door under the light.
Run forward into the ATRIUM WITH THE GLASS FLOOR, and deal with the remaining 5 commandos (11-15): Two slide down the ropes. One spawns immediately on the right side of the room.
The last pair may enter through either of the doors ahead, usually the right door if you're fighting the guy on the right.
If you're fast, you may meet the last of them as you exit the ATRIUM and make your way down the stairs toward the exit. If Lara won't target him from above with the shotgun, run/jump past him.
Then turn around and fire.
As soon as he falls, run, jump, or sprint to the stairs leading down. (Choose the left staircase when facing down the wide flight of stairs. It'll be on the right if you're facing the wide stairs.)
At the bottom of the stairs, continue into the CORRIDOR WITH RED WALLS .
Turn left and run into the next gallery to finish the level.
The achievement/trophy should unlock during the cutscene with Bouchard.
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