I can unlock the valkryrie but not the hydra. Why. I completed the humane labs heist already?

I completed the humane labs raid completely but I have only unlocked the valkryrie. I cant get the hydra and I was wondering if anyone knows how I can

I completed the humane labs raid completely but I have only unlocked the valkryrie. I can't get the hydra and I was wondering if anyone knows how I can get the mythical hydra. I play on the Xbox 360.

or:I completed the humane labs raid completely but I have only unlocked the valkryrie. I can't get the hydra and I was wondering if anyone knows how I can get the mythical hydra. I play on the Xbox 360.

or:I'm not familiar with this particular game, but did you complete all of the sidequests? Sometimes, games have secondary quests that you have to complete before getting all items and objectives.

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