Obelisk of Khamoon - "Enter the Crocodile" Achievement/Trophy
Now, let's get the "Enter the Crocodile" achievement/trophy. The goal: "Take 6 items underwater in one breath." Tread water above the shotgun shells (31) on the bottom of the pool and save the game. Swim down and pick them up.
Then quickly retrieve the small medi pack (32) to the left of the square hole in the bottom of the pool, then the magnum ammo (33) on the other side of that hole.
Roll and swim down through the opening. (Do not get air first, or you'll fail the achievement/trophy.)
Continue to the bottom of the vertical tunnel. Then follow the passageway forward...
...then left.
Now you're back at the long, straight passageway leading to the OBELISK. Continue straight ahead to the first set of alcoves. Swim into the alcove on the left.
Pick up the shotgun shells (34). Roll, swim across to the opposite alcove...
...and pick up a small medi pack (35). Roll...
...then continue along the passageway to the right, toward the next pair of alcoves.
The last pickup is here, in the alcove on the right. When you take these magnum clips (36)...
...the achievement/trophy should unlock. At this point, Lara will be out of air, so just surrender and reload.
You'll need to retrieve the 6 items again, but this time you can breathe after retrieving the pickups in the pool. Then, after swimming down the tunnels and getting the goodies in the alcoves, continue on to the OBELISK pool, get air there, and return through the tunnels to the pool where you destroyed the mummy.
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