Here is the full list of all 18 SHEEPO achievements.
Collect all 6 eggs and leave!
Collect all 5 hidden pictures
Reach 100%
Collect an.. Egg?
Collect a Slingo Egg
Collect a SlimeBall Egg
Collect a Froggo Egg
Collect a Spineworm Egg
Turn off BirdBot
Collect a LongBird Egg
Beat in less than 3 hours.
Beat in less than 2 hours
Beat in less than 1:30
Grab the longbird egg in less than 5 minutes
Complete your mission without dying
Beat on Hard Mode
Exit the spaceship within 1 minute
Collect 10 feathers in the first 10 minutes