This achievement requires that you play all seven of your tiles in a multi-snap. They must all be included in one multi-snap (conglomeration of words). Overall, this is much easier than the "Bingo" achievement. You just need to have all seven of your tiles contained in two or more words that are touching one another. In the left part of the photo below, a multi-snap using all seven letters is demonstrated. TIME is locked onto the board to start. By adding letters to create TASSLE going down, and then connecting the word ATE to that, a multi-snap has been created (because more than one word is connected) with all seven letters. Another way to pop the achievement is demonstrated on the right part of the image, again starting with TIME and using the same letters. Here, a 5-word, 7-letter multi-snap is created. Just try to jam all seven of your letters onto the board and make sure they are connected to pop this achievement mid-game.