Here is the full list of all 40 Cardpocalypse achievements worth 1,000 gamerscore.
Win Jacob's adventure
Tell on Kyle
Complete day 1
Let Angelo win
Complete day 2
Complete day 3
Complete day 4
Complete day 5
Finish the game
Apply a sticker
Complete Create-A-Card
Complete Mutate-A-Card
Change the rules of Power Pets
Change the cards of Power Pets
Prank Bruce
Win a match with a deck of neutral cards
Win a match after running out of cards to draw
Apply 6 stickers to one card
Play a match where every card in your deck has a sticker
Win the Secret Tournament
Hack into Mr Leroy's Computer
Own a common champion for each faction
Own a rare champion for each faction
Become best friends with Yolanda, Cedric, Sam and Ashley
Invite Bruce to join the gang
Complete all sidequests
Tear the Weeniebaby in half
Complete the game in Challange Mode without losing a match
Win a match without taking damage
Win a match without playing a minion
Do 30 or more damage in one attack
Play 8 cards in one turn
Own a 4/4 Tiny Dog
Gather a full audience for the Gamatotchi funeral
Give a great standup performance
Defeat Cupid... with words
Get ultimate revenge on Colin
Do everything Corey asks and get all of his snacks
Get all of Spud's stuff back from the big kids
Win each battle against the Oracle