I actually unlocked this one while I was still doing the bonus missions because I restarted a checkpoint quite a few times on the Spider Lair mission. I've included a walkthrough video for the bonus missions below in the hopes that you won't spend as much time backtracking as I did on my first run when stacking this game on the Xbox One's two versions. The time is cumulative so you'll undoubtedly unlock this eventually while going through the campaign and DLC missions.