Originally, this achievement was glitched on windows 8, if you had played the windows phone version of the game.
In the glitch, if you had played 100 or more words, this achievement wouldn't pop.
If you hade played 200 or more words on the windows phone version, both this achievement and the following achievement would have been glitched: Alternately, if you haven't played the Windows Phone version, this will pop normally at 50 words played in online games.
If you'd played between 100-199 or more words, only this achievement would have been glitched, and the above achievement would not have been.EDIT:
The glitch has now been patched. If you suffered from this glitch, sign into live through Alphajax on Win 8, and go to your stats page. This achievement will then pop, as well as the above achievement.