Here is the full list of all 10 Chook Sosig: Walk the Plank achievements.
You met Clive the fish.
Set all burnables on fire
You found all the hidden images
Became the new sea deity
You got the previously haunted treasure
You upvoted Hebble's photo
You spotted the kakapo!
You showed everyone the parrot, even if they didn't want to see him.
Listened to all tracks on the radio.
You almost wiped an entire island off the map.