Full list of all 44 The Simpsons Game achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Beat every episode target time
Get a perfect score on the final Boss battle
Win every time challenge
Win time challenge for Bargain Bin
Win time challenge for Mob Rules
Win time challenge for Invasion of the Yokel-Snatchers
Win time challenge for Five Characters in Search of an Author
Find all of the collectibles in Springfield
Find all of Marge's Try-n-Save Coupons
Finish every episode, find every collectible, and discover every Video Game Cliché Moment
Find all of Homer's Duff Bottle Caps
Find all of Lisa's Malibu Stacy Seals
Find all of Bart's Krusty Kollectible Koupons
Dude, need help? You've died, like, 10 times...
Win time challenge for Game Over
Find all of the Video Game Cliché Moments
Finish Game Over
Finish Five Characters in Search of an Author
Win time challenge for Medal of Homer
Win time challenge for Grand Theft Scratchy
Finish Grand Theft Scratchy
Finish Medal of Homer
Win time challenge for Big Super Happy Fun Fun Game
Win time challenge for NeverQuest
Finish NeverQuest
Finish Big Super Happy Fun Fun Game
Finish Bargain Bin
Win time challenge for The Day of the Dolphin
Finish The Day of the Dolphin
Win time challenge for Shadow of the Colossal Donut
Win time challenge for Enter the Cheatrix
Finish Shadow of the Colossal Donut
Finish Invasion of the Yokel-Snatchers
Finish Enter the Cheatrix
Win time challenge for Lisa the Tree Hugger
Finish Mob Rules
Finish Lisa the Tree Hugger
Win time challenge for Around the World in 80 Bites
Win time challenge for Bartman Begins
Finish Around the World in 80 Bites
Finish Bartman Begins
Win time challenge for The Land of Chocolate
Finish The Land of Chocolate
Easiest achievement...ever