Full list of all 46 Sesame Street: Once Upon a Monster achievements worth 1,105 gamerscore.
The base game contains 41 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 5 achievements worth 105 Gamerscore.
Play through the tutorial!
Run through the Electric Jungle without hitting any obstacles!
Dress up a monster in Seamus's Fashion Grotto!
Collect 110 pieces of fruit from the Tree of Plenty!
Help Marco blow out his birthday candles!
Throw a birthday party for Marco!
Throw trash into Oscar's trash can!
Pull up 50 weeds in Shelby's garden!
Plant a seed and water it to grow a little sprout!
Tune a set of flowers in 17 seconds or less!
Help rebuild Shelby's garden!
Send Seamus onstage in three different emperor outfits!
Give the dramatic flower chorus something to say!
Perform the broccoli pose!
Perform every pose in Seamus's play!
Help Seamus put on his play!
Pull a stick off of Grrhoof!
Make friends with a Puffalope!
Feed 50 biscuits to the Puffalopes!
Keep your balance, and don't fall in the mud!
Help Grrhoof make friends with the Puffalopes!
Catch a Doo-Ray while parachuting!
Reach the bottom of the Tree of Plenty without hitting more than three obstacles!
Wash off the Doo-Rays 10 times!
March in the parade with Tallulah and the Doo-Rays!
Help reunite Tallulah and the Doo-Rays!
Go through every wind gust on the sledding run!
Dust the snow off of all the monsters!
Narrate Ramona's story two or more times!
Do a trick on the sled!
Tell stories with Ramona!
Play through every chapter in the book!
After playing through the whole book, play through any page again!
Play through every page in the book three times or more!
Play through any page with two players!
Play through every dance page in the book with two players!
Collect 5 stars!
Collect 25 stars!
Collect 50 stars!
Collect 75 stars!
Collect all the stars!
Pop 50 bubbles!
Dress up an alien like a space cowboy!
Make the color green!
Collect all the notes while the tractor beam is stopped!
Reunite the aliens with their lost egg!