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