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This achievement can be earned by winning the battle while being (sufficiently) outnumbered.
It is known that the Tenacity buff is only applied to characters level 70 or above, so level 70 is a minimum for gaining this achievement.
As of the release of Patch 3.2.0, either the patch notes were wrong, or there was a bug with this achievement, because it was not correctly converted to a Feat of Strength. It was later corrected.