In The Cave there are 2 cans of corn that you find during your journey: the first one at the Miner's puzzle and the second hidden behind a crate on the Island.
I tried everything that came to my mind with them: blowing the miner's one with dynamite (it's easy, just leave the can where it stands and the miner will throw a stick at it), jumping with the island one in the volcano, getting drowned with them, and many other creative ways to try and get this achievement.
What am I missing? What am I supposed to do?