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