Passing the Gas Achievement in Halo Infinite
Kill a Grunt that’s been thrown by a Brute.
I got this near in the beginning where you first go out into the “open world” on a bridge nearby (there is a group of a few enemies stationed there).
All I did was driving in a warthog, placing it on the bridge, switching to the mounted gun and started firing. I guess if you’re in a good distance a brute will throw a suicide grunt. Just shoot it out of the sky and you’re good