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