The Funeral for a Friend trophy / achievement in God of War Ragnarok is unlocked after you attend the funeral of Brok. You’ll gain access to the A Viking Funeral favor after completing the main story, and you can start it by visiting the tavern in Nidavellir, Svartalfheim. From there you’ll be directed to the Aurvangar Wetlands, where the funeral takes place.

Funeral for a Friend

Attend the funeral