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