This is a very simple and quick achievement. From the Main Menu, click on "Play/Create Custom." Then click the "Create Zone" button in the bottom left corner of the screen. Enter a name for your zone. Click "OK" and then "Confirm." Then hit the "Editor" button on the right side and then "No Thanks" to skip the tutorial. Use your finger in order to drag and draw a few blocks on the screen. Make sure they are above the fail line. Then hit "Exit", "Keep Changes", and then "Exit" again. Achievement unlocked!