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