Image: Sucker Punch Productions / PlayStationOfficial screenshot from Sucker Punch Productions / PlayStation.
Monochrome Masters is the trophy for buying from both hidden dye merchants. The White Dye Merchant is in Izuhara and the Black Dye Merchant is in Toyotama.
Climb Wanderer's Pass in Kashine and buy one item from the White Dye Merchant. Then find the cave in the bamboo forest east of Kawamata Village and buy from the Black Dye Merchant.
The cheapest item is the Longbow look from the White merchant, at 5 flowers.
Image: Sucker Punch Productions / PlayStationA Fight for the Isle
Liberate every occupied area in Izuhara.
Image: Sucker Punch Productions / PlayStationA New Safe Haven
Liberate every occupied area in Kamiagata.
Image: Sucker Punch Productions / PlayStationBlood on Your Hands
Buy from the Crimson Dye Merchant and get a dye for the Sakai Horse Armor.
Image: Sucker Punch Productions / PlayStationChiyoko's Song
Complete every Animal Sanctuary on Iki Island.