Here is the full list of all 20 Donut County achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Make Chef's secret soup recipe.
Break 3 dozen eggs.
Finish Gecko Park without collecting the radio.
Set Pepper's trailer on fire.
Quack 100 times.
Destroy Trash King's monument.
Complete the boss fight without taking damage.
Lose the boss fight.
Break into the vault at Raccoon HQ.
Find Trash King's secret getaway vehicle.
Destroy the donut shop.
Destroy Raccoon Lagoon.
Hack into the mainframe.
Win the boss fight.
Bring everyone back from underground.
Complete the Trashopedia.
Stock up on gamer fuel.
Destroy Trash King's monitor.
Fly through the donut hole.
Release the hot air balloon.