The Backyard Brawl trophy / achievement in God of War Ragnarok is unlocked after defeating the Mysterious Valkyrie in the Lower Wildwoods of Midgard. This is actually a fight between Kratos and Freya which occurs during The Lost Sanctuary main quest. This is a fairly easy fight for anyone who has encountered Valkyrie before, and Freya uses many of the same attack moves as those from God of War 2018.
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