Here is the full list of all 38 Castaway Paradise Complete Edition achievements.
Read 50 chit chats
Remove 25 cobwebs
Harvest 50 crops
Make a profit of 500 gems on the Stock Market
Donate 15 shells
Unlocked a gate
Donate 15 fish
Rebuild Francis' Pirateshack
Make a profit of 2000 gems at the Bank
Remove 25 stones
Changed every piece of outfit
Remove 50 weeds
Collect 25 pieces of garbage
Rebuild Gustave's Bakery
Used every piece of equipment
Donate 15 bugs
Completed 25 quests
Donate a collectable
Rebuild Harold's Museum
Rebuild a bridge
Get your first collectable
Completed the tutorial
Donate all bugs
Donate all fish
Donate all shells
Donated every collectable
Rebuild Amelia's Planehouse
Rebuild Angus' Trailer
Rebuild Victoria's Mansion
Rebuild the Lighthouse
Unlock the second room in your house
Completed 100 quests
Make a profit of 5000 gems on the Stock Market
Grow every type of fruit
Grow every type of flower
Grow every type of crop
Wore an outfit of the opposite gender
Live the luxury life of a VIP