After retrieving the first key from the pool with the crocodile, as shown in the previous section, return to the carved stone block near the pyramid. In order to unlock the "Cat's Cunning" achievement/trophy, you'll need to take a slightly longer route to the next key. Normally you'd climb up the pyramid and shift the 2 movable blocks there to get inside.
Instead, push the carved block at ground level toward the pyramid.
Then go around to the left and pull it once.
Move over/around the block to the opposite side and push it four times, until it's sitting just beyond the corner of the pyramid.
Move around to the left side and push it 8 times, along the side of the pyramid.
The block should now be close enough so you can reach the temple with the blue crocodile murals. Climb on top of the block and take a running jump to grab the raised opening with the shotgun shells (16). Pull up.
Take the shells, then drop into the room below.
When you pick up the 2nd ORNATE KEY (17), sitting on the carved cat's face, the achievement/trophy should pop, as long as you didn't move the two blocks at the top of the pyramid.
The gold door at the end of the passageway doesn't open from this side, so climb the stairs, pull up into the window, and drop back down outside.
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