You can kill 20 enemies by shooting either c4 (blue dummy) or claymores (pink dummy).
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There is no rhino emblem. Unless you are talking about the Ghost emblem, in that case it would be reaching 10th Prestige.
Get 25 AC-130s
You must be level 61 then nuke the enemy while your loosing in a game type such as , tdm,domination,demolition.
The hyena...You have to get 50 kills with a RPG.
get to level 48 and you unlock the ACR