To easily get the “Killer Killer” achievement, go to the “Cruz” section of the ocean and capture the fort. Make sure your ship’s harpooning capabilities (strength and storage) are upgraded. One of the fishing locations is at the coordinates 537, 340, but the others vary, so check your map. When you near a fishing spot, interact with it, and the killer whale will appear. Defend yourself and attempt to harpoon the whale until you are successful.
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