Below is a guide on the locations of the Pillars of Honor in Ghost of Tsushima. For the Lost and Found trophy, you will need to collect 1 Sword Kit from a Pillar of Honor.
Ariake
Sibling Rocks
This pillar can be found west of Sibling Rocks in Ariake. Interacting with it will give you the Warrior’s Brush.
Azamo
Wakoui’s Island
This pillar is located on an island in Azamo and is east of Azamo Bay.
Sakimori Overlook
This pillar can be found on top of Sakimori Overlook in Azamo. Interacting with the pillar will give you Mamushi Venom.
Hiyoshi
Hidden Springs Forest
This pillar can be found in the southeastern part of Hidden Springs Forest. The pillar is at the top of a cliff overlooking the ocean.
Kaneda Inlet
This pillar can be found north of Kaneda Inlet in Hiyoshi. Interacting with it will give you the Fuujin’s Secret.
Kashine
Shigenori’s Peak
This shrine can be found west of Shigenori’s Peak. Interacting with it will give you Spring Bamboo.
Komoda
First General’s Field
This pillar can be found north of First General’s Field in an open field near an abandoned camp. Interacting with it will give you Genbu’s Darkness sword kit.