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