Wait, wait. You only need 45. You should have gotten a heads up to talk to Eris and forgot. If Eris isn't talking to you then you probably blew off her request to do the Bunker-4 mission. Do you have a quest talking about killing a Centerion in bunker 4 cosmodrome ?
Edit : this mission is called : Hunger Pangs
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Thanks very much. I'm pretty sure I had 47 before challenge mode but the more I think about it, maybe it was 45. Damn. I will check whether I have done that mission. Aaaaagh! Cheers!