Start a single player "Hot Letters" game mode game (Play Custom->Hot Letters). Before every turn, shake he bag by moving the left thumbstick up and down until it catches on fire. Don't shake too long because the tiles inside will burn up. Quickly choose 'Deal All' to get the tiles from the bag. They should look like they're on fire. Quickly make a word using at least one of the hot letters before they cool off. Making short words quickly is the key to getting this. Repeat 5 times and finish the game for the achievement.