I'd recommend doing the "fake" multiplayer glitch for this trophy, which you can find how to do here: https://pastebin.com/Jgf6vPeJ
Before you start the round, make sure to either vote for the Cavern or Cove maps, as these have water in them that will be useful later. Once you start the round, switch to the account you want the trophy on.
When you get to the center chests, try and look for potions of regeneration, and food. These should be in plentiful supply. You'll also want to keep an eye out for any fire charges. If you can't find any, that's fine, you simply need to run around the map checking the other chests for fire charges. Once you've found some, you can begin.
Go close to any body of water (this is why you should vote for Cavern or Cove, sinc they both have plenty of water in them). Once near the water, throw a fire charge near your feet to create a fire. Then, stand in the fire and begin to take damage. Once your health bar is close to depleted, jump into the water. Eat some food and/or drink your regen potion, wait for your health to recover, and then repeat.
It will take a while, but eventually the trophy should pop.