Full list of all 20 AlphaJax achievements worth 200 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Windows Phone.
You played 50 games
You played your first 75-99 words
You started 5 games by inviting other players
You scored 400-449 in a game
You played 10 games
You won a game by less than 5 points
You cleared your rack in a single move
You played your first 50-74 words
You won your first game
You played a rematch
You completed your first game with no tiles remaining
You scored 300-399 in a game
You scored a word multiplier and a letter multiplier with one word
You created a random game
You played a skill match game
Play your first 100+ words
Play a game with a friend
Score 2 word multipliers with one word
Score 450+ in a game
Get a rating of 1500+