This Seeking Tech guide will explain how you can unlock the From the Hip trophy in Ghost of Yotei.
To do so, follow the video and text instructions below:
First off, you need to complete the Guns and Consequences quest at Oshima Coast to unlock the Tanzutsu weapon.
Afterwards, bow at Altars of Reflection so that you can learn the Standoff Unlock: Pistol in the Revenge skill tree.
You can then start a Standoff. If your successful with the first two strikes during the sequence, then you should be able to use the Tanzutsu to unlock the trophy.