Perform 5 Eagle's Talon takedowns.
This trophy is missable. You'll automatically unlock this Skill in the main mission "Path of the Dead" in Kuwaq Yaku. This Skill allows you to fire rope arrows at unsuspecting enemies whilst hiding in a tree, hoisting them up and hanging them from the branches. Only one body can be suspended per branch.
When you acquire this Skill, you'll almost immediately be tasked with trying it out, which will grant you your first Eagle's Talon kill. You can farm these kills via checkpoint restarts.