This is the Bacon! achievement for cooking a Boar with Molotov. the best way to go about this is loading up "The Village" level whether that be progressing there for the first time, fast travelling back or just continuing the game after completion. By the river there's a burnt log cabin with empty bottles inside, craft a Molotov and then walk outside the cabin. There are a pack of Boars that spawn there, just be careful and throw the Molotov on them. Video guide attached below.