I know a lot of people wanted this, including me, cause the Masked trophy didn't pop, so I started a new game and it took me 10 hours to get to the point where you get the trophy. hopefully many people find it useful. And since I'm posting it, I included my platinum save.
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Save1: Platinum save
Save3: Masked trophy save, you'll be outside the house of the Grey Mourner, her quest is already done, just go in and talk to her to get the last Mask Shard and get that trophy.