This is easiest to accomplish in the first level in the Sanctar Temple. The “Candles” are matchsticks with what look like bombs on the top of them. You need 1 red Tinykin to light it. It does use up the Tinykin once you’ve thrown it. For the temple you will need a total of 11 red Tinkykin. They can be found all around if you run out go to the second level and walk around the outside of the second level and there are some on the ledge. Once you have lit all the candles on the first and second level a cut scene will play and the achievement will pop.