Knife to a Gunfight
From Halopedia, the Halo wiki
The achievement's description states that the kills must be earned in Firefight, however the achievement could also unlocked by playing Invasion. Indeed, this was how nearly all players would have unlocked the achievement, as there were very rarely any Firefight matchmaking playlists which included the option to play as an Elite.
The achievement's name refers to the phrase "Don't bring a knife to a gun fight," which means that you shouldn't enter a challenging situation without being properly prepared or equipped.
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