Early off in the story, your main character will decide to take Cyclop's Eye and shove it up a random goat's behind. This trophy will task you to go back to Kephallonia after you have finished the prologue of the game and get the Eye back from the goat you stuck the eyeball in.

Kephallonia has many goats to kill around the area and it's random which one has the eye. It's essentially down to RNG if you get the eye or not. Simply keep killing goats around Kephallonia until you loot the Eye. Once you do, then you will be awarded this trophy.