Complete each achievement to get the allotted gamerscore. The numbers between the () is the points given for each achievement.
| Achievement | How to unlock |
| All Decked Out (15) | Collected all Creepy Treat Cards. |
| Battle Buds (5) | Defeated a monster in combat with a friend by your side. |
| Binary Bouncer (10) | Used the Robot Costume to Boost off of 15 different ramps. |
| Chompin' Champ (15) | Won all prizes in Bobbing for Apples. |
| Do the Monster Bash (10) | Got the jump on 10 monsters. |
| Downsized! (15) | Defeated BoJonn in battle. |
| Dozer Dodger (15) | Defeated Metxel in battle. |
| Dressed to Quest (5) | Acquired 5 Costumes. |
| Leave some for the rest of us! (15) | Collected a total of over 4,000 candies. |
| Make it Work (10) | Won the Autumn Haven Mall Costume Contest. |
| Mask-O'-Raider (25) | Completed all Quests in the game. |
| Master of Disguise (10) | Used every Costume Ability in battle. |
| Sweet Justice (25) | Finished the game! |
| The Last Gourdian (10) | Acquired the Pumpkin Costume. |
| They'll be worth a lot someday (15) | Collected all Battle Stamps. |
| DLC Achievements | Grubbins on Ice |
| Birdbrain Beatdown (15) | Defeat Araxia in battle. |
| Jeepers Peepers (5) | Acquire the Eyeball costume. |
| Playin' Hooky (5) | Use the Pirate hook on 5 unique ziplines. |
| Revolutionary Hero (15) | Complete all quests in Repugia. |
| Short Stack (10) | Find the mysterious visitor in the cliffs of Repugia. |
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Submitted by:
intoxication on December 10, 2010