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