Here is the full list of all 19 Cow Milking Simulator achievements.
Deliver a total of 1000 liters of milk
Shoo away 100 UFOs
Create a total of 100 goods
Throw something into the well
Use the same power up 5 times during the same match
Try out every prop
Earn a total of 5000 cash
Use every power up during the same match
Fill 6 buckets in 60 seconds
Shoo away a UFO for the first time
Play Cow Milking Simulator Holiday version!
Scare 20 chickens
Hit the UFO with a bucket and take it back
Earn a total of 25000 cash
Create a total of 1000 goods
Deliver a total of 3000 liters of milk
Unlock all the goods
Earn a total of 50000 cash
Deliver a total of 7500 liters of milk