COOL STORY BRO
Listen to the Story of the Final Grunt
Halo 3 COOL STORY BRO – Achievement / Trophy Guide
At the very end of the mission “Halo” you will be on a Warthog. Drive up the point where Cortana gives you the 90% update on the firing sequence. You will see a rock formation. Make sure you don’t drive past this rock or your teammate will shoot the grunt with the cool story. Walk a little further and turn right to see the grunt. If you get close to him he will start talking and the achievement will pop.