Hey guys, I decided to go back and finish 1000/1000 for chieve points. Does anyone know if I save a checkpoint halfway through the mission in breaking without having died, then die, back out and start from that checkpoint, will I still get the achievement? Just planning my run. I know there are some huge speed running exploits on that mission, but I don’t really want to use them.
I don’t have the Achievement but from looking online it seems checkpoints can be a Life saver for this one. It also looks like your team mates can die just not the whole team at once. If you die hit pause and restart checkpoint. Source http://www.xboxachievements.com/game/halo-5-guardians/achievement/109119-Harbinger.html
As of right now that tactics does not work.
I got through to the Wardens and saved. After finding a trick to beat the Wardens after I put in nearly 8 hours accomplishing the Prison Break Achievement on Legendary by myself, I went back and loaded my save. Did the trick to skip the Wardens and the achievement never popped.
It looks as though you must beat this level in one sitting. (Would be nice if more guides and even the achievement made it clear saving does not work.)