Fear the Pink Mist
From Halopedia, the Halo wiki
Fear the Pink Mist is a Halo 3 Achievement. It is awarded for killing 5 enemies with a Needler in a ranked, free-for-all match or Campaign.
It is represented by a red circle with a Needler and five hearts.
This achievement is most likely a reference to the large explosion created by firing a Needler continuously at someone. The name also appears to be a reference to the movie Jarhead, in which snipers refer often to the "pink mist" after a successful kill.
There is an easy way to achieve this. During CQB levels like Crow's Nest (Level), find a Needler and fire it on Grunts and Brutes at will. Remember, without reloading a Needler you can easily get 2 Needler explosions, so getting 5 would be easy, as long as you have cover and good aiming skills.
It is commonly considered to be the easiest achievement to get in halo 3.
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