The exotic missions The Whisper and Zero Hour have triumphs that cannot be completed (bugged). Specifically Swift Whisper, Flawless Whisper, Quarter Hour, and Flawless Zero Hour. I’ve also noticed that the triumph points awarded for these are valued at 1. Other triumphs are also valued at 1, but I finished these before I experienced the bug, although I do remember these triumphs having a higher value at the time of completion.
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They're aware of both issues - they have listed Whisper in the known issues page though. [quote]Completing The Whisper exotic mission with correct conditions doesn't award Swift Whisper or Flawless Whisper Triumphs.[/quote] https://help.bungie.net/hc/en-us/articles/27062192032404-Destiny-2-Year-7-Known-Issues-and-Vital-Information