To make soup, turn the stovetop to the Pot setting, get the sink and fill a cup of water and dump it into the pot. Then throw a couple of ingredients into the pot and turn on the heat. After a few moments the water will boil and you'll find a can of soup in the pot. Repeat this procedure and use the can of soup as one of the ingredients to create a second can of soup and the achievement will unlock (after you exit the game).