Good day.
Completed "Vox Obscura" quest on Master difficulty and didn't receive the "Tank Master" triumph. Is this a bug? Where to go with the problem?
Hello there, EnTerris!
Did you wait for the 'Mission Complete' banner to appear before you left the activity? If no, that's why you don't have it. You [b][u]must[/b][/u] wait for the 'mission complete' banner to appear before you leave any activity to be fully credited for it.
Unfortunately, you will need to run this activity again.
[quote]Is this a bug?[/quote]
This is not a bug, it's by design. An activity isn't complete until the 'mission complete' banner appears.