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 1,500,000 points! (Score Attack 10 mins)
Play Score Attack (10 Minutes) until the very end!
Finish Score Attack (5 Minutes) without using a bomb!
Emit sparks for 1 second!
Score 1,000,000 points! (Score Attack 5 mins)
Finish Score Attack (5 Minutes) with no mistakes!
Score 500,000 points! (Score Attack 5 mins)
Play Score Attack (5 Minutes) until the very end!
Beat the game with every maze visual.
Beat the Time Trial mode!
Eat 30 ghosts in succession!