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