Here is the full list of all 9 Girls Like Robots achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Finished Act 2!
Make 200 Girls happy while winning levels!
Get 150 medals in your Bag O' Happy
Finished Act 1!
Finished Act 3!
Get gold medals in every level!
Reach level 50 in Nerd Drop!
Beat the final level without any (surviving) Space Seals!
Leave no bonus unclaimed! WHAT'S IN THE BOX?!