Full list of all 17 Wordament achievements worth 200 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Windows Phone.
Found all the themed words in a round
You are a world champion of Wordament!
Found all the digrams in a round
Completed 100 rounds
Achieved the highest cumulative score in the hour.
Finished first place in a round
Ranked in the top 10 in 10 rounds
Found the longest possible word in a round
You've played Wordament in more than 1 language
Completed 10 rounds
You played a game where you used all 16 tiles to make words
You found a theme word
You used rotate to find more words
You placed better than 50% of the players in a round
Placed in the top 10% of a round
You beat all your Frenemies in a round
You found a digram word