How do you light a torch in Achievement Unlocked 3?

Answer 1

with your torch in your inventory, make sure it is showing in your "use" window in the bottom left of your screen. Press Y to light your hand torch. To light torches standing alone in the game (such as inside the caves in the Tundra area) hold down R with your torch lit standing next to the torch you are trying to light and press A.

Answer 2

you have to jump on the big torch in the room where the hamster king is and jump on the torches.