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