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.
Find Trash King's secret getaway vehicle.
Stock up on gamer fuel.
Destroy Trash King's monument.
Break 3 dozen eggs.
Finish Gecko Park without collecting the radio.
Make Chef's secret soup recipe.
Destroy Trash King's monitor.
Break into the vault at Raccoon HQ.
Lose the boss fight.
Complete the boss fight without taking damage.
Set Pepper's trailer on fire.
Complete the Trashopedia.
Fly through the donut hole.
Bring everyone back from underground.
Win the boss fight.
Hack into the mainframe.
Destroy Raccoon Lagoon.
Destroy the donut shop.
Quack 100 times.
Release the hot air balloon.