Here is the full list of all 25 Pac-Man and the Ghostly Adventures achievements worth 1,000 gamerscore.
Complete all levels of the Pineapple Tank arcade mini-game.
Defeat 100 enemies as Metal Pac.
Collect at least one Arcade Token in every level.
Complete the final level of the game.
Complete all levels of the Pacerchini arcade mini-game.
Increase Pac's maximum Health to 6.
Complete all bonus levels.
Unlock Chapter 6.
Complete all levels of the Lemon Rocket arcade mini-game.
Unlock Chapter 5.
Defeat 300 Blue (Scared) Ghosts.
Complete all levels of the Cherry Copter arcade mini-game.
Unlock Chapter 4.
Increase Pac's total lives to 50 or more.
Collect enough Globe Energy orbs to unlock the Temple of Mystery.
Defeat 100 enemies as Granite Ball Pac.
Unlock Chapter 3.
Collect enough Globe Energy orbs to unlock the Temple of Ice.
Unlock Chapter 2.
Collect enough Globe Energy orbs to unlock the Temple of Slime.
Chomp 50 recycling bins over the course of the game.
Defeat 100 enemies as Chameleon Pac.
Defeat 100 enemies as Fire Pac.
Complete an entire level without losing a life.
Defeat 100 enemies as Ice Pac.