Here is the full list of all 14 Scrabble achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Complete one match in any mode.
Score a Bingo.
Beat the Very Easy AI.
Win 5 matches in Quick Play.
Score over 225 points in any mode.
Score over 325 points in any mode.
Spell at least two words in a turn.
Use at least 2 types of Premium Squares in one turn.
Score over 50 points in one turn.
Beat the Hard AI.
Beat 3 Very Hard AI in one match.
Make a word in the last 5 seconds remaining in your turn in any mode.
Use an Emoji in Multiplayer.
Spell the word "SCRABBLE" on board.