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