Uncharted 4: How to Get All Optional Dialogue Conversations

Chapter 8: The Grave of Henry Avery

Optional Dialogue 6 – After coming across the three crucifix statues in the tomb, talk to Sam (this is also a Journal Entry).

Optional Dialogue 7 – After completing the puzzle that used those same three statues, talk to Sam again.

Chapter 9: Those Who Prove Worthy

Optional Dialogue 8 – Once the puzzle with the crucifixes and bucket of water is complete proceed through the door and follow Sam up the cliff. While making your way up you’ll get the prompt to chat with him.