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