Apparently completing the Closer to the Heart mission and listening to the final radio message in the HELM prior to listening to all of the other 7 messages causes the Ahamkara Tales triumph to become bugged. The triumph appears to be permanently stuck at 7/8, even though I have now listened to all 8 messages. Even going back with an alternate character and completing the Closer to the Heart mission a second time and listening to the final radio message again still does not grant completion for the triumph.