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