Complete one of the following achievements to collect their Xbox Live Gamerscore points:
Unlockable: --- How to Unlock:
Bull's Eye! (10 GP) --- Kill five ghosts with one harpoon.
Dead Eye (50 GP) --- Finish five rounds without missing a shot.
Demolition Man (50 GP) --- Kill ten ghosts with one explosion.
Exorcist (100 GP) --- Complete Arcade mode.
Extreme Exorcist (200 GP) --- Defeat the final boss without losing a life!
Full Arsenal (50 GP) --- Unlock all weapons.
Ghostblaster (200 GP) --- Kill 1000 ghosts!
Grand Tour (50 GP) --- Unlock all rooms.
It's a Party! (30 GP) --- Manage to amass thirty ghosts on-screen!
Necromancer (100 GP) --- Die 1000 times!
Take that, Physics! (10 GP) --- Jump on five bullets in one round.
This House is Clean! (50 GP) --- Exorcise ten ghosts at once.
Unchallenged (100 GP) --- Complete all challenges.