Yesterday, I attempted the Harbinger Achievement Solo. I followed "Halo Completionist"s guide on Youtube. This was Published on Nov 6, 2015 I can see why that method no longer works. A dev probably didn’t agree with this method and set out to make it not work.
Unfortunately, I got into a group of 4 and very easily beat it according to the wording on the achievement: Complete The Breaking on Legendary difficulty without the entire fireteam dying.
This is my interpretation of it:
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Any of your teammates can die, up to 3 of your teammates dying. Just not all 4 members.
-What is considered dying? I would say that dying is when a Spartan has an X above where they died. If all 4 of the Spartans are down on the ground but they haven’t died and the checkpoint is restarted, then it should still count. One would assume that if you restarted the checkpoint before the game restarted the checkpoint naturally after all 4 members died, it would still count. -
The level must be completed in one sitting - no save/restore, etc.
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You may restart the checkpoint
I completed the level with my firefight team of 4 individuals with the above interpretation. No achievement was granted to any of us. Not sure what we did wrong. I would assert that this is a bug and the achievement is bugged period, or that the definition of the achievement needs some work to describe the new conditions. Perhaps you can’t restart checkpoint now? Perhaps your team can’t go down at all even if you restart checkpoint? Who knows.