A Worthy Opponent

A Worthy Opponent is an exploration achievement earned for defeating one of the champions found wandering Pandaria.

Trivia
The name of this achievement, along with those of Could We Find More Like That? and Glorious!, are quotes from Kormac the Templar from the Blizzard game Diablo 3. In the game, one of these quotes is spoken by the Templar each time a rare or champion mob is slain.