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