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