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