Once you have documentation of their agreement to settle the debt for the stated amount and you make that payment, they are then obligated to notify the court within a set period that the debt is discharged. That terminates any further obligation for the debt.
To later attempt attachment of assets or garnishment of pay, they would have to go back to the judgment court and state that the debt remained unpaid. The court would then, just as with the initial trial awarding the judgment, provide notice to you, and you would have the right to attend. If you have proof of discharge, they would likely have some serious explaining to do before the judge as to why they filed an assertion of unpaid debt. They are highly unlikely to take such an action......
Check the rules of civil procedure for you state, and determine the period in your state within which the judgment creditor is required to file notice with the court of satisfaction of the debt. That is standard and required in all states, and is formal basis for recordation of discharge of the debt.
Give it a week of so after that date, and then contact the office of the clerk of the court, and verify that the notice of satisfaction has been filed. Once it is of record, the court records the satisfaction, which then permits exclusion from your credit report at 7 years from the initial date of the judgment.
