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