Ghostship: Aftermath - Final Boss and Ending - Riggs The Getaway

Final battle and ending for the Riggs - The Getaway storyline. The alien queen disappears after slapping me once (maybe she's camera shy?), so I gib the alien king with a shotgun then bugger off for coffee and beans. I finished this game in story mode, but for some reason the achievement didn't pop up until 10 minutes later after I had stopped recording.