Two for One
From Halopedia, the Halo wiki
Two for One is a Halo 3 multiplayer achievement. It is awarded for killing two enemies with one Spartan Laser shot in a ranked free for all playlist (i.e. Lone Wolves). Due to the difficulty in earning this particular achievement, people have been working together to let others earn this achievement. The achievement awards the player 5 Gamerpoints.
It is represented by a white circle with a red star. On top, there are two skulls and a Spartan Laser.
One way to get this achievement is to grab the Spartan Laser on snowbound, usually it can be any game type, head towards the back of the cavern which is the main "Arena" and make sure only the muzzle is sticking out of the gravity feild. Since more than likely all the players will be here and usually only take the tunnel entrances, they'll be to busy getting at each others throats to notice you charging up your laser.
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