Microsoft Ultimate Word Games

In Wordament games, theme words show up in blue in the word list on the left. In adventure mode maps, some levels have an objective for theme words, so as you work toward 100 stars in Wordament Adventure mode, you should make good progress towards this achievement and possibly unlock it. If not, while grinding up to level 80 in quickplay (see the "Expert Seeker" achievement solution for more information on that), every quickplay match you play has an objective to use one of the special tiles, such as PRE- or -LY in a word. Each one of the words you make with these tiles counts towards the 50 theme words you need. So this achievement will unavoidably unlock while grinding to level 80.