God of War

Once you start meeting Travelers, you get the option of the Traveler Armour set when crafting at Brok's Shop.
Craft the Chest, Greaves and Bracers, to get the trophy.

As you progress through the story, and explore Midgard a bit (examine the gates, to light the torches in the Lake of Nines) you will come across a few formidable foes called Travelers.

They have a large two handed sword, and some walk backwards with a shield on their back. You will need to kill several. And then speak to Singri or Brok to craft each piece of armor. And then BLING! Trophy is yours.