Here is the full list of all 6 Fox! Hen! Bag! achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Pressed the cable car button at least 5 times continuously.
The hen ate the bag of grains.
Tried flying down the mountain.
The fox ate the hen.
Solved the riddle.
Helped the skeleton get down to the bottom of the mountain.