This one's pretty simple. Just find 1337 different words in Boggle games. It doesn't have to be one in a single game - it's cumulative. I recommend playing with the Bonus Tile, Time Attack and Word Find game modifiers, as this will help you find more words in each game. In Time Attack, you gain an additional 2 seconds for each word you find. With the Bonus Tile, a random tile will be worth x2, x3 or x4 for 15 seconds, and this applies to your score and bonus time (so if you make a word with a x4 tile, you'll get 8 more seconds instead of 2). Finally, Word List shows you a list of all possible words in that particular game, meaning you only have to find them.