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