You can get 4 Urns of Power in any of your playthroughs, as well as an additional by completing Challenge of the Titans. In order to get this Trophy, you need to start a second playthrough (aka Bonus Play). You can skip cutscenes to when you gain control of Kratos. Then go to the menu and press L1 or R1 until you see where your Urns of Power are. Simply enable 2 of them and the Trophy is yours.
Secret Urn Location Guide
[Urn #1] Urn of Gaia (Red orbs give 10x normal amount) - The first urn is located shortly after beginning the game in the Rhodes Palace. When you get to the section where you have to move the concrete block, with a breakable golden eagle on top, kick the block through the door and then continue to drag it to your right and then forward. The camera will pan back and you will be able to see 3 chests on top of a ledge. Break the golden eagle, allowing you to jump on top of the block, and grab the urn.
[Urn #2] Urn of the Gorgons (Weapons turn enemies to stone on contact) – After you have retrieved the Golden Fleece back track to the door with the Gorgon head. The one that shoots the gorgon gaze at you. Ignore this door for now and go to the left; where you went originally. Once you get to the Ruins of the Forgotten go to where you tipped over that stone gazebo type building. Go through the door again and begin to backtrack through this section once more. When you get past the huge gears in the bloody river continue along the path and use the time stop ability to cross the spinning gear one more time. Once you get to the conveyor belt with the gorgon heads flashing go to the 2nd set and use the Fleece to repel the flash. This breaks a hole in the wall revealing the urn.
[Urn #3] Urn of Olympus (Grants Infinite Magic) – In the area where you earn the Spear of Destiny there will be a Fates statue that you are able to drag around. Grab it and push it down the ramp of the hallway you just came from and then to the pool of water you crossed earlier. Go across the pool and activate the amulet, then run around to where the floor switch was guarding the chests beyond. Step on the switch and run through the door and the urn is yours.
[Urn #4] Urn of Prometheus (Infinite Rage of the Titans) – When you are climbing Atlas there will be a point where you have to climb across the ceiling. Look for a large stalactite hanging from the ceiling. Break it and it will reveal a hole you can climb up. Urn is in here.
[Urn #5] Urn of the Fates (Extends Combo Meter time) – Achieve an overall ranking of Mortal or above on the Challenge of the Titans.
[Urn #6] Urn of Poseidon (Replaces Chronos Rage with Poseidon’s Rage) – Achieve an overall ranking of Spartan or above on the Challenge of the Titans.
All credit goes to original authors at playstationtrophies.org, and this is merely updating truetrophy fans with these guides. http://www.playstationtrophies.org/game/god-of-war-ii/trophy...