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