Here is the full list of all 29 Edna & Harvey: Harvey's New Eyes achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Help the old man.
Multiple endings? I need to see 'em all.
Finish chapter three.
I hate mini games!
Defeat all Harveys.
Defeat the Mother Superior.
If in doubt - give him a clout!
Droggeljug!
Sleep!
Did someone here order a pizza?
I hear someone singing ...
They don't really have quicktime events in this game, right?
Row, kid! Row for your life!
Finish chapter two.
Hoo hoo. Whit woo. Terwit terwoo.
Find the right path.
Justice prevails.
That doesn't apply to me.
Even the sun follows my command!
I need more coffee! More!
Aaaargh!
I think I've been here before ...
Finish chapter one.
Floating in the summer sky.
X marks the spot.
Shibuya power!
How's that supposed to help?
Lilli's arms were too short.
I don't need no tutorial!