Achievement Name: Bane of the Emperor

Gamerscore: 20G

Guide: Precision shots = Headshots

You will have to play through the story a fair amount before you can get this. In other words, you cannot unlock this achievement until you reach the planet Mars.

This doesn't have to be done in a story mission. You can do this in patrol missions too.

This can be done on any level with the Cabal. The Cabal infantry can be easily recognised by the Warhammer like soldiers

Difficulty: Medium