This trophy is called
"Ressurector of the Hiragumo" and it requires the user to gather all the fragments of the Hiragumo during the Main Mission titled, "Spider Nest Castle" in the Kinki Region.
Fragments IV and V are obtained in a reverse order in the game, which is why they're listed out of order. After obtaining III, William exits the caves near fragment V.
All fragments are guarded by a giant spider. The easiest way I found to defeat them was to lock onto them and strafe to avoid the stamina reducing/slowing venom. Wait for them to leap, roll to the side, and take two or three strikes at their backsides.
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Hiragumo Fragment I is covering the gate, towards the second Shrine, right after dropping down from the first spiderweb ramp near the beginning of the Mission.
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Hiragumo Fragment II is past the second Shrine, up the hill with the boulder, and off the ledge with the broken fencing on another wooden door. You'll be able to see it below, in the distance, from the broken fencing before dropping down.
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Hiragumo Fragment III requires you to go through the doors covered by the spider which held the second fragment. Proceed through the house, following paths on the right and around to a wooden door. The door leads to a small yard with a small building. The yard has spiderwebs leading to a hole in the ground. Drop down the hole and proceed through the spider infested cave. In the middle of the second cave, the third spider awaits with the fragment.
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Hiragumo Fragment V is reached at the end of the hillside path, after exiting the spider caves via the ladder. There will be an area with a couple of Spiders, Revenants, and a Biwa Boku-Boku. Defeat them and turn around towards the archway at the entrance of this area. On the tower will be the spider nest.
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Hiragumo Fragment IV is down a path that's right of the third Shrine. Follow the path down a ladder, or a small ledge before the ladder path (safer), and then cross the web bridge to the giant spider nest.
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Hiragumo Fragment VI is to the left side of the castle, after the third Shrine, hanging out with a kodama. Be sure to use a ranged weapon to lure the medium sized spiders to you before engaging the giant spider.
That's about it. Once the sixth fragment is collected, the trophy will unlock.