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.
Complete the boss fight without taking damage.
Lose the boss fight.
Break into the vault at Raccoon HQ.
Break 3 dozen eggs.
Find Trash King's secret getaway vehicle.
Finish Gecko Park without collecting the radio.
Make Chef's secret soup recipe.
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 the donut shop.
Destroy Raccoon Lagoon.
Stock up on gamer fuel.
Quack 100 times.
Set Pepper's trailer on fire.
Release the hot air balloon.