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