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