Here is the full list of all 50 Viva Piñata: Trouble In Paradise achievements worth 1,000 gamerscore.
Play One Box Co-op for 1 hour
Use a Piñata Card
Evolve a Moojoo from a Doenut
Teach a Piñata all of their Tricks
Evolve a Hoghurt from a Rashberry
Obtain a special Piñata from the website (or trade one with someone who has)
Evolve a Polollybear from a Fizzlybear
Restore 10 of Piñata Central’s Computer Records
Obtain a Choclodocus
Take a Special Photograph
Wear a Piñata 'Costume'
Win 10 Piñata shows
Make 3 Desert species resident
Play One Box Co-op for 3 Hours
Create 1 set of Twin Piñatas
Have a Spectral Locomotive in the garden
Knock 5 Sweets into Seed Holes using the Shovel
Complete all Challenges in Region 7
Grow all Desert plants to maturity
Evolve a Pieena from a Pretztail
Take 10 Photographs (Normal)
Evolve a Parmadillo from a Fudgehog
Grow all Arctic plants to maturity
Earn a Gold Combat Medal
Make all Arctic species resident
Complete all Challenges in Region 2
Create 10 sets of Twin Piñatas
Packet contains all surface types
Complete all of Langston’s Destination Challenges in Region 1
Collect milk from a Flapyak
Play 4 Player Online Co-op for 1 hour
Use 10 different Piñata Cards
Teach 10 Piñatas all of their Tricks
Win a Piñata race
Restore all of Piñata Central’s Computer Records
Restore 30 of Piñata Central’s Computer Records
Win a Piñata show
Evolve a Chocstrich from a Cluckles
Knock 1 Sweet into a Seed Hole from Long Distance
Create a Wildcard Piñata
Complete all Challenges in Region 3
Create 10 Wildcard Piñatas
Complete all Challenges in Region 4
Complete all Challenges in Region 5
Win 10 Piñata races
Complete all Challenges in Region 6
Have a Woo Woo Train in the garden
Make all Desert species resident
Make 3 Arctic species resident
Complete all Challenges in all Regions