Here is the full list of all 12 Word Puzzle achievements worth 200 gamerscore. It takes around 4-5 hours to unlock all of the achievements on Xbox 360.
Get "30 Combos" in Arcade mode
Receives first victory in local 2-player battle
Get "5 Combos" in Arcade mode
Get "50 Combos" in Arcade mode
Successfully disarms a bomb within 5 seconds in Survival mode
Disarming 6 bombs continuously without missing any of Word Bombs in Survival mode
Disarming all the bombs & pass all the stages in Survival mode
Score 4000 points in Survival mode
First time completed in Xbox LIVE Ranking battles
Score 1000 points in Free Play mode
3 wins in a row in Xbox LIVE Ranking battles
5 wins in a row in Xbox LIVE Ranking battles