At the main menu, select the "Play Garden" option. Create a new garden, and enter "Piñata People" as a garden name. After that garden loads, you can now access a sign at the far left of the main menu that allows you to view the credits. Note: Before breaking the pinatas to view the credits, destroy the debris to find hidden accessories. They will no longer be available after all the credit pinatas are broken. The Wishing Well will become unlocked after all the credit pinatas have been broken.

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Card Sharp (10 points): Use a Pinata Card.
Famous Pinata (20 points): Obtain a special Pinata from the website (or trade one with someone who has).
Records Keeper (30 points): Restore 10 of Pinata Central's Computer Records.
Master Exhibitor (20 points): Win 10 Pinata shows.
Desert Collector (10 points): Make 3 Desert species resident.
Couch Socialite (10 points): Play One Box Co-op for 1 hour.
Master Couch Socialite (20 points): Play One Box Co-op for 3 Hours.
Region 7 Challenger (20 points): Complete all Challenges in Region 7.
Desert Green Fingers (20 points): Grow all Desert plants to maturity.
Arctic Green Fingers (20 points): Grow all Arctic plants to maturity.
Come And Have A Go (20 points): Earn a Gold Combat Medal.
Master Arctic Collector (20 points): Make all Arctic species resident.
Region 2 Challenger (20 points): Complete all Challenges in Region 2.
Packet Bulger (20 points): Packet contains all surface types.
Region 1 Challenger (20 points): Complete all of Langston's Destination Challenges in Region 1.
Full House (10 points): Play 4 Player Online Co-op for 1 hour.
Master Card Sharp (20 points): Use 10 different Pinata Cards.
SpeedFreak (10 points): Win a Pinata race.
Expert Records Keeper (50 points): Restore all of Pinata Central's Computer Records.
Master Records Keeper (40 points): Restore 30 of Pinata Central's Computer Records.
Exhibitor (10 points): Win a Pinata show.
Region 3 Challenger (20 points): Complete all Challenges in Region 3.
Region 4 Challenger (20 points): Complete all Challenges in Region 4.
Region 5 Challenger (20 points): Complete all Challenges in Region 5.
Master Speedfreak (20 points): Win 10 Pinata races.
Region 6 Challenger (20 points): Complete all Challenges in Region 6.
Master Desert Collector (20 points): Make all Desert species resident.
Arctic Collector (10 points): Make 3 Arctic species resident.
Master Challenger (50 points): Complete all Challenges in all Regions.

Additionally, there are 21 secret achievements:

Moojoo Evolution (20 points): Evolve a Moojoo from a Doenut.
Twin Birth (10 points): Create One Set of Twin Pinatas.
Hoghurt Evolution (20 points): Evolve a Hoghurt from a Rashberry.
Yakity Yak (20 points): Collect milk from a Flapyak.
Dinokeeper (50 points): Obtain a Choclodocus.
Polollybear Evolution (20 points): Evolve a Polollybear from a Fizzlybear.
Fancy Dress (30 points): Wear a complete Pinata "costume" of accessories.
Wildcard Variant (10 points): Create a Wildcard Pinata.
Chocstrich Evolution (20 points): Evolve a Chocstrich from a Cluckles.
Candied Camera (10 points): Take 10 Photographs (Normal).
Master Candied Camera (20 points): Take a Special Photograph.
Choo-Choo (10 points): Have a Woo Woo Train in the Garden.
Pieena Evolution (20 points): Evolve a Pieena from a Pretztail.
Parmadillo Evolution (20 points): Evolve a Parmadillo from a Fudgehog.
Wildcard Variant Master (20 points): Create 10 Wildcard Pinatas.
Twin Birth Master (20 points): Create 10 sets of twin Pinatas.
Master Instructor (20 points): Teach 10 Pinatas both of its tricks.
Long Shot (20 points): Knock 1 Sweet into a seed hole from a long distance.
Instructor (10 points): Teach a Pinata both of its tricks.
Choo-Choo Master (20 points): Have a Spectral Locomotive in the Garden.
Gone Clubbing (10 points): Knock 5 Sweets into seed holes using the Shovel.