I’ve also wondered if Archie will start to believe Henry. Not only is he Henry’s therapist, but he’s also treating David, who is having flash-backs, and Mr. Gold, who needs someone to confide in. I think something big will have to happen for Archie to believe though. Even the mine collapse in episode 5 wasn’t enough to convince him. Nevertheless, Archie is becoming braver and speaking acting according to his conscience more. Perhaps an encounter with August (aka Pinocchio) will help Archie to remember FTL. When Archie said for Mr. Gold to chat with August, I doubt Archie realises who August really is. However, I think he’s just saying something useful to the plot development.
From the official promotional photos from episode 20, we see Emma chatting with Archie. At the very least, she is probably asking him about gaining custody over Henry. Also, here is a link for an interview that the actor who plays Archie gave: http://www.huffingtonpost.com/2012/04/28/once-upon-a-time-scoop_n_1461535.html
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy