The 13th Floor - Stealth Replay for "Mission Impossible" Achievement/Trophy
After unlocking the "Dodge This!" achievement/trophy, as shown in the previous section, we reloaded our save from the point where Lara enters the hallway near the sleeping guard. Start by walking into the glassed-in office to avoid making too much noise.
NOTE: Again, if you wake the sleeping guard, he'll activate a machine gun turret over his desk, making it next to impossible to get the card, and another guard (not encountered if you use stealth) will appear at the end of the hall beyond the elevator, and you'll fail the "Mission Impossible" (stealth) achievement.
Either kill the sleeping guard with a single headshot...
...or walk around him slowly and quietly. Take the HIGH-LEVEL ACCESS CARD (11) (184/239) sitting on the desk.
Use it in the card reader on the wall nearby. This opens the STOREROOM on the right and deactivates the lasers out in the hall.
Search the shelves in the STOREROOM to find a small medipack and 2 sets of HK clips (12-14) (185-187/239). You can run while in the storeroom, but if you left the guard sleeping, be sure to walk through the office.
Exit the office, turn right, and continue down the hall. (You can run again once you reach the crawlspace.)
Press the button to call the ELEVATOR. Enter and press the buttons inside to ride up to the 16th FLOOR.
When the doors open, step forward cautiously.
Cutscene: Two guards in conversation at the right end of the hallway.
Do not run out of the elevator or the 2 security guards will notice and start shooting. This will alert a third guard, who'll come up the ramp at the end of the hall behind the first two. To get through using stealth and only three bullets, set the HK on sniper mode and walk toward the open elevator doors. Position Lara at the left side of the opening and turn right.
Use the scope to target either guard's head, visible just above the large, gray box. When you headshot the first guy, the second doesn't react. (Maybe they weren't really work friends after all.) So you can take a moment to line up a second headshot.
Turn around and head for the triangular door at the left end of the hallway. Swipe the HIGH-LEVEL ACCESS CARD in the card reader to open the door.
The 2 orange-suited workers in the COMPUTER ROOM ignore Lara as long as she doesn't draw her weapon. (If she does, they'll cower and activate a machine gun turret.) Press the button on the square console to activate a hologram of the IRIS. Doing this also opens a door at the far end of the hall.
Return to the corridor and continue past the ELEVATOR almost to the end. The third guard, mentioned above, is patrolling the ramp ahead on the right. As long as you're quiet and stay out of sight, he won't come all the way to the top.
So, stand facing the wall to the right of the doorway and watch him. When he moves down the ramp...
...draw your weapon, step out, and headshot him before he turns around.
Continue down the ramp. If you pressed the button in the COMPUTER ROOM, the next door opens as you approach.
Go through the ROOM WITH THE METAL DOME ABOVE THE IRIS and enter the SUIT LOCKER ROOM.
Press the button to the right of the orange-suited worker to open the locker. An ACCESS CODE DISK (15) (188/239) falls out onto the floor. Pick it up.
Then return to the ELEVATOR the way you came. Press the button to ride back down to the 13th FLOOR.
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