Here is the full list of all 15 9Ball Pocket achievements worth 1,000 gamerscore.
Put in a row two balls
Put in order two balls
Put in the same shot two or more balls
Put in order three or more balls
Put in the same shot three or more balls
Clear Round 1 in Arcade Mode
Clear Round 2 in Arcade Mode
Clear Round 3 in Arcade Mode
Clear Round 4 in Arcade Mode
Clear Round 5 in Arcade Mode
Clear Round 6 in Arcade Mode
Clear Round 7 in Arcade Mode
Clear Round 8 in Arcade Mode
Clear Round 9 in Arcade Mode
Clear Round 10 in Arcade Mode