
In the first section, we gathered supplies and eliminated the first 13 home invaders. If you've run out of ammo or just want the satisfaction of finding every item, exit the mansion, turn right...

...and go through the opening in the ivy-covered stone wall.

Go over or around the low wall/hedge on the left into the grassy area at the end of the ASSAULT COURSE.

Near the last little tree on the right, you'll find another box of shotgun shells (45).

This pickup is easy to miss, but you'll need it for the "Souvenirs from Around the Globe" achievement/trophy, which unlocks here if you found all 585 items in the game.

When you have it, head back toward the ASSAULT COURSE.

Another gunman (14) and his dog (15) approach along the alley between the mansion and the wooden climbing structures. They may appear one at a time or together. Hop back as you shoot the dog...

...and flip side to side if necessary to avoid being shot.

As soon as the man and dog die, the final enemy, a burly guy with 2 big guns (16), appears near the MAIN ENTRANCE and makes a beeline toward you. This mini-boss is like the one in the crate room at the end of the OPERA HOUSE.
If you aren't interested in achievements/trophies, just try and kill the big guy quickly. Move in fairly close, get a lock, and jump side to side while firing. Or, try to get behind him then chase him in tight circles while shooting. He's tough, but when he falls, that's the end of the game.
To unlock the achievement/trophy "I Really Think I've Seen Enough!," you'll need to "make the Fiamma Nera boss appear in the final cutscene." For this to happen, you must lure him into the house and up to the BATHROOM before killing him. This may take a few attempts, so save the game in a new slot as soon as you kill the last regular enemy. Then roll and run back through the doorway in the ivy-covered wall.

If you like, you can take a few shots at the boss as you pass.

Continue forward, taking running jumps along the gravel drive, then turn left through the front door.

Back in the MAIN HALL, run/jump up the left staircase.

At the top, make a U-turn to the left...

...and run/jump along the landing into the BEDROOM, where you started.

Run/jump over or around the bed, past the GUN CUPBOARD, then right into the blue-and-white-tiled BATHROOM.

Position Lara near the shower alcove in the far corner, roll...

...and wait for big ugly to arrive. As soon as Lara aims, fire continuously until his health bar is almost gone. (Enable Boss HP bars in the Controls menu if you haven't already done so.)

Then hop back into the shower stall and sidestep left into the corner (i.e., your right, Lara's left). This forces the boss to move into the area in front of the shower so he'll be in frame during the next cutscene.

Now finish him off.

When the final cutscene begins, as long as he's visible...

...the achievement/trophy should pop.
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