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.
Get 100 Surf Idols.
Get a total of 27 Shells.
Get Shell in Leaf Slide 3.
Get Shell in Leaf Slide 2.
Get Shell in Leaf Slide 1.
Get 1 Trophy in Boneyards.
Unlock Z.
Go on Pen-Gu North legendary wave for the first time.
Get all surf boards.
Get 3 Trophies in Pen-Gu North.
Get a total of 20 Shells.
Get 1 Trophy in Pen-Gu North.
Unlock Elliot.
Get a total of 16 Shells.
Get 2 Trophies in Volcano.
Get 50 Surf Idols.
Get 1 Trophy in Volcano.
Get a total of 12 Shells.
Unlock Geek.
Get 4 Trophies in Pen-Gu South.
Get all accessories.
Get a total of 8 Shells.
Get 25 Surf Idols.
Get 1 Trophy in Pen-Gu South.
Unlock Arnold.
Get a total of 4 Shells.
Get 2 Trophies in Shiverpool.
Get 1 Trophy in Shiverpool.
Complete the tutorial.