583 collectibles in Ghost of Tsushima.
Yasha's Embers
Yasha's Embers is a Sword Kit that reskins Jin's katana and tanto. You collect it from the Pillar of Honor in Hidden Springs Forest, southeast of Hiyoshi Springs in Izuhara, and it is purely cosmetic.
Yatga
Yatga is one of the 50 Mongol Artifacts, pieces of the invaders' culture and warfare you can study. It sits at Salt Wind Estate in Izuhara, and finding 20 artifacts counts toward the Know Your Enemy trophy.
Yellow Chrysanthemum
Yellow Chrysanthemum is a dye for the Sakai Horse Armor. Tsubaki gives it to you once you have collected 12 Sakai Banners on Iki Island. Like every dye it only changes colours.
Yharnam Helm
Yharnam Helm is a straw hat that nods to Bloodborne and its hunters. You earn it by finishing the Blood-Stained Shrine, one of the Wind Shrines.
Yharnam Vestments
Yharnam Vestments is a dye for Kensei Armor. You earn it by completing the Blood-Stained Shrine, one of the Wind Shrines that reward special armor dyes. Like every dye it only changes colours.
Yoshinaka Bay Pillar of Honor
The Yoshinaka Bay Pillar of Honor is a memorial shrine at Yoshinaka Bay in Otsuna, Toyotama. Visit it to collect the Hunting Bear sword kit, a cosmetic look for Jin's katana and tanto.
Yuzu Peel
Yuzu Peel is a Sword Kit that reskins Jin's katana and tanto. You collect it from the Pillar of Honor close to Sibling Bay in Toyotama, and it is purely cosmetic.