Tomb Raider: Underworld

All credits go to PlakaPlaka and radi500 for this video walkthrough. It is a walkthrough for PC, but the game is identical on Xbox 360.

At the beginning, you'll start at the top of Valgrind, and you'll have to drive your way down. Then, you must carefully climb the central tower and align the large disks so their symbols match to the ones on each platform. Now, you'll enter the Valhalla maze. The correct turns are right, left, right, left, left and right. Then, once you climb over the next barrier, you'll enter a room with a long stone walkway. This will be broken by hammers coming down from the walls. Now you'll slide down a falling slab, jump, grab onto one of the last remaining pillars and make your way to the front edge of it. From here, drop down on the pole and shimmy on backwards to another slope leading to a larger, more stable pillar close to where you came from. Then, continue climbing up the two back pillars until you reach a room with a mechanism connected to the hammers. Climb this, then take one of the hammers to the other side, then go to the next mechanism. Repeat this until you've crossed the chamber. Then, you'll defeat a large Yeti thrall. Once this is done, climb on up and a cut scene will ensue. Once the next mission loads, you'll unlock the achievement.