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For certain acheivements, like steppin' razor and overkill, its almost impossible to get them without boosting. Most of them you can do. Most of the acheivements that unlock armor can also be done in the campaign.
Someone told me that u can get a group of friend together and let each other take turns getting the achievement a.k.a cheating. I havent done it cause it is cheating but its an idea all the same.