Here is the full list of all 20 Kathy Rain achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Barely resisted the urge to barbeque a bear
Amplified Goober's lung cancer
Felt no apparent need to let Lenny down gently
Made your best efforts to miss the funeral
Really had it out for Goober
Finished day four
Finished the game
Wanted to engage in a good 'ol book burning
Finished day three
Lost track of time on the road
Totally mesmerized by Goober's monologues
Became a huge fan of those sweet, addictive, not to mention cancer-inducing sticks of tobacco
Finished day two
Learned a cold hard truth about your face
Engaged in flirtatious behavior on the computer
Finished day one
Rediscovered yourself as a creature of the night
Reunited with a furry friend
Tortured an imprisoned bum
Felt like literally taking the wheelchair for a spin