: On the first level on Heroic or Legendary, you have to clear the big hill
: where the Kraken is seen shooting near. Since only the Elite's survival
: matters to the achievement, killing his minions doesn't affect it. He
: shoots at you and your teammates on the way up, but soon as he steps on
: the platform at the top he becomes an ally. I've gotten the achievement,
: but he got swarmed by Soldiers the moment he reached the top. :(

Yeah, on Heroic without allies it's pretty difficult to both keep your AI from killing him and staying away from him so he doesn't aggro on you while also getting ahead of him and killing those turrets that rip him to shreds. He *might* have had a line to Osiris if he survives at the end and turns into an ally, but unfortunately I had my sound down... :( I was also kinda' sad he didn't join me in fighting the Prometheans, but I can understand why that would have led into questions with the final cutscene.