This achievement occurs during Episode 4 - Double Visions
Once you've broken Edna and Emmett up you'll taken to the Courthouse where Emmett will be on the roof, say the following:
• Dialog (Emmett): Any.
• Dialog (Emmett): Any.
• Dialog (Emmett): Any.
• Dialog (Emmett): "You care about inventing!"
• Dialog (Emmett): Um.
• Dialog (Emmett); "You care about me!"
• Dialog (Emmett): "No."
• Dialog (Emmett): "I did it for the hell of it."
• Dialog (Emmett): "You're Delusional!"
The achievement will unlock once they have finished talking