Title essentially, completed the full run Solo Flawless and didn't receive the triumph.
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Yep, same here. The "Flawless Zero Hour" triumph unlocked, but not the "Zero Deaths" triumph. Title screen said 199 kills and 0 deaths. Also, I had somewhere around 8 minutes left on the clock when I hit the chest (I wasn't speed running it, just taking my time, nice and slow).