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