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