Fortunately, credit reports are by individual. A person with good credit will not be affected by their spouse’s bad credit UNLESS they have joint accounts.
For example, if you purchase a home together, the mortgage will be a joint debt. If your new spouse is handling the bills and often forgets to pay your joint mortgage on time, then his late mortgage payments will show up as late payments on your credit report. This applies to any other debts that have in both names. Any activity will reflect on both of your credit reports (good or bad).
Could his older tax lien prior to your marriage and mortgage come back and hurt you? Yes, I believe it could. If you purchase a new home together as I described above, your spouse’s old tax lien could be put onto your new house. This would definitely affect you. I strongly advise that you check with a real estate attorney before purchasing a home together.