I believe the newest patch broke them or something...
Im going by this guide - http://soe.hubpages.com/hub/Conversations-Achievements-Guide-Diablo-3
And this video - http://www.youtube.com/watch?v=gkSJV823gCA
For the 3 different conversations
**The Truth - Available as you start The Breached Keep (Act III).
**Secrets of the Tome - Available as you start Machines of War (Act III).
**The Templar's Lesson - Available as you start Falls of the High Heavens (Act IV).
All the rest of all the conversation achievement's i got without an issue. It is the Templar i am having an issue with. Right on the video i can see when they are available and doable, But they don't appear on my side.
Is this just me? Did it change to different time periods? Or is it really bugged? I do believe it is bugged though.