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