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