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