You must also be current with your assessments (in addition to having paid off the judgment). Once you're current and have paid the judgment, you can file a motion to vacate the judgment. See 735 ILCS 5/9-111. Get a statement from the HOA showing that you are current in payments and have paid the judgment. If the HOA has rented your unit to a tenant, you may not be able to recover possession until the tenant's lease expires.
This answer does not constitute legal advice and does not create an attorney-client relationship. You should contact an attorney to discuss the particulars of your case.