Conversationalist Achievement - Assassin's Creed
Go through every dialog with Lucy.
Achievement Value:
20 Achievement Icon:
This one can be hard to miss, just make sure that every time you get out of the Animus AND before you get back in that you walk up to Lucy and press Y (or any button, I'm not sure.) You should hear a conversation between the two of them. Be aware that there can be more than one conversation each time.