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