Microsoft Ultimate Word Games

Each Wordament adventure map level has 3 stars that can be earned on it by completing each of the three objectives. For this achievement, you need to earn a total of 100 stars across all months. This will take around half of a single adventure map if you get all three stars, or you can break it up over multiple levels or multiple maps. In general, Wordament is the easiest of the three game modes, and adventure mode levels only take a minute or two to get all three stars, so it's very fast to blow through a single map to get 100 stars.

The achievement will unlock upon earning your 100th star.