Here is the full list of all 21 Cornucopia Demo achievements.
Harvest your first Fruit Tree
Defeat the Spider Boss
Earn 10,000 Gold
Get Stuck in the Waterwheel
Catch your first Large Fish
Try Every Scratch Card
Discover the Old Mines
Feed Munger for the First Time
Bomb an NPC
Harvest your first Berry Bush
Catch your first Fish
Harvest your first Vegetable
Pass out from Exhaustion
Refine 10 Times
Brush an Animal
Plant your first Seed
Open your first Letter
Give your first Gift
Decorate your Home for the First Time
Steam Train was Spotted
Catch 10 Fish