Here is the full list of all 12 Pac-Man Championship Edition DX+ achievements worth 200 gamerscore.
Score 2,000,000 points! (Score Attack 10 mins)
Score 1,000,000 points! (Score Attack 5 mins)
Finish Score Attack (5 Minutes) without using a bomb!
Beat the game with every maze visual.
Beat the Time Trial mode!
Play Score Attack (5 Minutes) until the very end!
Score 500,000 points! (Score Attack 5 mins)
Eat 30 ghosts in succession!
Score 1,500,000 points! (Score Attack 10 mins)
Play Score Attack (10 Minutes) until the very end!
Finish Score Attack (5 Minutes) with no mistakes!
Emit sparks for 1 second!