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