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