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