What can happen if you get a money judgement for a credit card from a lawyer

Unless the lawyer gets it from court, nothing. Once a judgement is ordered by a court, the person awarded the jidgement can attach a levy to your bank accounts, have your wages garnished, or possibly attach a lien to your property. What they are allowed to do will depend on where you live. What they actually depends on how serious they are about getting their money back.

A judgement is the award given by a court as the result of a suit. Sounds like you were sued for not paying a credit card. The judgement can then be used to attach some assets of your to pay the amount owed.