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