Here is the full list of all 11 Storm Boy achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Have all 3 Pelicans get angry during the Feeding Mini-Game
Feed all 3 pelicans once
Play each Mini-Game once through the Remember menu
Say Goodbye to Mr Percival
Save the Sailors from a Sinking Ship
Have Mr Percival Fetch the ball from underwater 3 times
Leave an artwork on the beachfront
Stay underwater for the maximum amount of time
Swim to the deepest part of the Ocean
Find 20 Cockles!
Change Direction in the Sanctuary Dream mini-game 15 times