problems with ronin camo for crossbow

Black Ops II Xbox 360

I just got my bloodthirsty medal using only the crossbow with an acog attachment. The Cano did not unlock and I have the video in theatre to prove it. Does it mean using no attachments? It just says " Get a blood thirsty using only the crossbow". I reviewed the video to make sure I didn't screw up. Can anyone help clear this up.

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Registered: ‎27-01-2012