You cant unlock it. You have to buy it from the Xbox Live Store or PlayStation Store
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You do not unlock Ascension you purchase First Strike from the PlayStation Store for $15
On PS3 you need to go to playstation store and then purchase the Ascension Map Pack for £11.99 i think and then it will be on your downloads tab and you will have to install it.
You do in Ascension zombies from the first map pack for black ops.
APRIL !
In Black Ops multiplayer you unlock the AK-47 at level 38.