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