This achievement requires that you open a cumulative total of 50 luggage across all of your games. Luggage are awarded by getting Bingo and by daubing numbers on your cards surrounded by the silhouette of a suitcase. After the game has completed, your luggage will show up on screen. You must tap each one to open them, which will require one silver key to open each luggage. Keys can be purchased from the Shop or from daubing numbers surrounded by the silhouette of a key. You can also get them as rewards from luggage. This will take 30 to 50 games to unlock, depending on how many cards you play and your supply of keys.