Story related, can’t be missed.
*** Spoiler - click to reveal ***This is during The River Lament where you'll have to kill King Midas. It's pretty simple to kill him, for all you have to do are the quick time events to knock him unconscious. Once you knocked him out, carry him towards the lava flowing outside the cave by pressing the Circle Button button. While you're carrying him, you need to drop him every now and then to kill the Rabid Hounds that come to attack you. While fighting the Rabid Hounds, Midas will crawl away from you so beat him unconscious and continue to carry him towards the lava flow. Once you made it, he'll grab onto a rock so rotate the Left Stick button and throw him into the lava which will kill him and turn the entire thing to gold. Once you've killed King Midas your trophy will unlock.
All credit goes to orginal authors at playstationtrophies.org, and this is merely updating truetrophy fans with these guides.
http://www.playstationtrophies.org/game/god-of-war-ghost-of-...