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