Here is the full list of all 29 Surf's Up achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox 360.
Complete all the lessons in the tutorial.
Get 1 Trophy in Shiverpool area.
Get 2 Trophies in Shiverpool area.
Get 1 Trophy in Pen-Gu South area.
Get 4 Trophies in Pen-Gu South area.
Get 1 Trophy in Volcano area.
Get 2 Trophies in Volcano area.
Get 1 Trophy in Pen-Gu North area.
Get 3 Trophies in Pen-Gu North area.
Unlock every accessory.
Unlock all the boards in the game.
Collect 25 Surf Idols in surf and leaf slide levels.
Collect 50 Surf Idols in surf and leaf slide levels.
Collect 100 Surf Idols in surf and leaf slide levels.
Beat the hi-score and get the shell in leaf slide 1.
Beat the hi-score and get the shell in leaf slide 2.
Beat the hi-score and get the shell in leaf slide 3.
Start surfing on the Pen Gu North Legendary wave!
Get a total of 4 Shells.
Get a total of 8 Shells.
Get a total of 12 Shells.
Get a total of 16 Shells.
Get a total of 20 Shells.
Get a total of 27 Shells.
Unlock Arnold by getting the second shell in Shiverpool 2.
Unlock Elliot by getting the second shell in Volcano 2.
Unlock Geek by getting the second shell in Pen-Gu South 4.
Unlock Z by getting the second shell in Pen-Gu North legendary.
Get 1 Trophy in Boneyards.