The 13th Floor - "Nailed It!" Achievement/Trophy
In the previous section, we snuck through the laser-trapped ducts and obtained a HAMMER and a golden rose secret. Now we need to make our way back to the start. Walk to the edge of the laser-trapped floor vent. Wait for the laser array to move away. Then jump over the vent...
...crouch, and crawl into the passageway on the right.
Follow this duct past the barred window overlooking the SUIT ROOM...
...to the next bend, where Lara can stand. Now there are moving laser arrays in the passageway where you began the level. This sequence can be tricky, so definitely quick-save first.
Stand on the safe tile between the two crawlspaces and watch the lasers. When the lower array moves away...
...run after it, but stop at the double lines on the floor where the duct segments meet. Notice the ceiling is a little higher beyond this point. Wait here as the lower array moves away, and the upper array moves toward you. When they reverse, get ready to move.
Just as the lower array reaches the doorway with the chute, ahead on the right, jump forward over it. If you time it right, Lara will take no damage.
Run forward to the end of the passageway and quickly duck to avoid the upper laser array. Lara is also safe from the lower array here.
Crawl to face the ladder on the left wall. Wait for the upper array to move toward you and away again.
Then stand, grab the ladder, and climb up before the lasers return.
Follow the duct to the end, grabbing the HK ammo (7) (180/239) on the way. You'll see two short cutscenes featuring the IRIS artifact and the armored soldier in the room below.
IMPORTANT: If you want all pickups as well as the achievements/trophies, SAVE THE GAME BEFORE OPENING THE PADLOCKED GATE at the end of the duct.
At the end of the duct, use the HAMMER to pry open the grate and unlock the "Nailed It!" achievement/trophy. When you have it, reload your last save if you want all pickups.
Or, if you don't care about 100% completion, after using the HAMMER to open the gate, skip the next section. Continue from the "ROOM WITH FISHBONE LADDER," here. You will miss one small medipack.
When you shoot the padlock, instead of prying it off with the hammer, there are a few different ways this section can go. If you want a stealthy approach for the "Mission Impossible" achievement/trophy, stand close enough to the padlock so you can see the hand icon.
Set the HK to sniper mode with silencer*. Then fire once to break the lock. (No need to use the scope.)
The duct collapses...
...dumping Lara into the room below, but thanks to some amazing Tomb Raider Logic™, the armored soldier does not notice. (Continue with the next section.)
- OR -
If instead you choose to take on the armored soldier, set the HK on sniper or burst mode, with or without silencer, step back a bit, and shoot the locked gate.
The duct collapses, and Lara slides down. Immediately pivot left...
...and use the scope to aim for the soldier's face (his one vulnerable spot). You'll need to land a headshot before he manages to discharge his energy weapon twice...
...since two shots will kill Lara.
NOTE: Armored soldiers are not counted as official kills on the in-game Statistics screen, but if they notice Lara, your stealth streak is broken. Check the footnote in the main walkthrough for details.
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