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