Here is the full list of all 31 Shift Happens achievements worth 1,000 gamerscore.
"Push" a character over 8 meters
Die in the level "103a: Push & Pull"
Finish the Laboratory [Multiplayer]
Finish each Laboratory-level with 75 coins and Bonus Object [Multiplayer]
Finish the Laboratory [Singleplayer]
Finish each Laboratory-level with 75 coins and Bonus Object [Singleplayer]
Finish the Forest [Singleplayer]
Finish the Forest [Multiplayer]
Finish each Forest-level with 75 coins and Bonus Object [Singleplayer]
Finish each Forest-level with 75 coins and Bonus Object [Multiplayer]
Finish the Canyon [Singleplayer]
Finish the Canyon [Multiplayer]
Finish each Canyon-level with 75 coins and Bonus Object [Singleplayer]
Finish each Canyon-level with 75 coins and Bonus Object [Multiplayer]
Finish the Grotto [Singleplayer]
Finish the Grotto [Multiplayer]
Finish each Grotto-level with 75 coins and Bonus Object [Singleplayer]
Finish each Grotto-level with 75 coins and Bonus Object [Multiplayer]
Finish all levels (including bonuslevels) [Singleplayer]
Finish all levels (including bonuslevels) [Multiplayer]
Finish ALL levels with 75 coins and Bonus Object [Singleplayer]
Finish ALL levels with 75 coins and Bonus Object [Multiplayer]
Struggle yourself free [Multiplayer]
Don't use the Shift in the level "102: Troubling Teamwork" [Singleplayer]
Splitting up doesn't get you anywhere
A "little" unfair distribution of coins [Multiplayer]
Throw a crate and let your partner catch it [Multiplayer]
Get squished by a small crate with the big character
"Steal" the chain-coin from your partner who did all the hard work [Multiplayer]
Beat the timechallenge in all levels [Singleplayer]
Beat the timechallenge in all levels [Multiplayer]