Bip! Bap! BAM! Achievement in Halo: The Master Chief Collection

This achievement may come naturally to most players during their playthrough of the Campaign. Generally, despite the difficulty one is playing on, Tayari Plaza will most likely be the mission that allows for the easiest lineup for head shots on Grunts as you pass through the city streets towards your objective. If needed, you can always turn on the “Competitive Scoring” HUD in the Campaign lobby so that you’ll know exactly when you’ve scored a Triple Kill (it will be indicated by the medal). Just wait until a few Grunts are near each other, then use your Pistol for some quick and easy head shots.