The A Grizzly Encounter trophy / achievement is unlocked after fighting the grizzly bear form of Atreus during the Surviving Fimbulwinter main quest, which is the first one in the story for God of War Ragnarok. This will be your first boss encounter in the game and it should be a relatively easy one for most players, but if you need help you can check our strategy guide on our Bjorn Boss Fight in Wildwoods page.

A Grizzly Encounter

Battle the Bear