Here is the full list of all 45 Broken Age achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Complete Broken Age
Stand up for someone even though you haven't met him
Stand up for someone even though you haven't met her
Talk to the boss
Complete Act 2 of Broken Age
Find a genius
Commission a custom garment
Visit someone in jail
Return a missing spaceship part
Get a family member's help on a big project
Chart a course away from danger
Deploy a weapon of mass destruction
Reconnect with some old friends
Uncover an unsavory scheme
Return a heavy duty spaceship part
Examine all breakfast options
Remove 8 sad faces from the Bassinostra
Get to the ship's brain
Answer some tough questions quickly
Complete all rescue missions with zero errors
Travel to a forbidden location
Inhibit a powerful entitiy
Take Control of the Boom Arms
Hear 20 reasons why Gary won't grab that
Disrupt Shay's daily routine
Take down Mog Chothra
Endure a tight situation as long as you can
Leave an isolated town
Reunite a mother and child
Get to know someone in a precarious position
Escape the Maidens Feast
Learn all you can about Sugar Bunting
Complete Act 1 of Broken Age
Unlock all Broken Age Achievements
Make a Spoon Sweat
Feed two different people a healthy snack
Find 30 unique reactions to the Spoon
Clear up a tangled situation in one attempt
Tell a great joke in one attempt
Follow up on a successful performance
Execute a PERFECT escape
Get to know a stranger
Make someone strut their stuff
Start a group dance party
Complete Broken Age in under an hour, not counting loading and paused gameplay.