To achieve this you must finish your first puzzle. This will likely be one of your first achievements for the game. The easiest option is to enter the easy category and select the 'Turtle' level. Once the puzzle has started tap a part of the screen that has no tiles on and a menu should pop up on either side of the screen. There will be a light bulb symbol which when pressed shows you 2 tiles that match. Use this feature to get through the first puzzle with ease for it can be very useful. You can also use this on every other level if you choose making other achievements easy to obtain.