Reaper of Souls - Achievement Guide - Kormac N' Cheese

1. Start at Act 5.2 (Souls of the Dead) - have the conversation "Kormac's Unease" with him.
2. Start at Act 5.3 (The Harbinger) - have the conversation "The Grand Maester" with him. Immediately following this conversation, a new conversation will be available - "The Templar's Quest."
3. Have the conversation "The Templar's Quest," and complete it. Return to the enclave. Exit your game, and re-enter (at the same place, Act 5.3, The Harbinger) - you can have the conversation "The Corruption of the Templars" with him.
4. Start at Act 5.5 (The Pandemonium Gate) - have the conversation "Peace of Mind" with him.
5. Start at the "Siege Runes" quest checkpoint under Act 5.6 (The Battlefields of Eternity) - have the conversation "The Future" with him.
6. Start at Act 5.7 (Breaching the Fortress) - have the conversation "Talking to Eirena" with him.
7. Start at Act 5.8 (Angel of Death) - have the conversation "A Future with Eirena" with him. And her.* Chicka-bow!

* Unlike what I did, it would probably be more appropriate to stand closer to Eirena during this conversation.
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0:00 - Kormac's Unease
0:40 - The Grand Maester
1:12- The Corruption of the Templar
1:45 - Peace of Mind
2:15 - The Future
3:06 - Talking to Eirena
3:42 - A Future with Eirena