This One's for Jenkins!
From Halopedia, the Halo wiki
This One’s for Jenkins!
This One’s for Jenkins! is an achievement in Halo: Combat Evolved Anniversary. It is awarded for killing at least 50 Flood combat forms within the level 343 Guilty Spark, on Heroic difficulty or higher.[1] It is represented by an infection form on a Monitor, with "50" above it.
The achievement is worth 10 Gamerpoints.
Trivia
The achievement references Wallace A. Jenkins, who was infected by an infection form and transitioned into a combat form, though he was able to retain some of his own consciousness.
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