Yes, Sensei

From Halopedia, the Halo wiki

Yes, Sensei

Yes, Sensei is a Multiplayer achievement in Halo: Reach. It was awarded when a player earned a First Strike in a matchmaking game.[1]

Following the shutdown of Xbox 360 Halo online services on January 13, 2022, this achievement is no longer attainable.[2][3]


The achievement's name is a reference to the 1984 film The Karate Kid, in which the antagonistic Cobra Kai dojo advocates striking first, and striking without mercy.[4] Sensei means both "teacher" and "first strike" in Japanese.[5]