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