It takes decades to refine your retirement plan. Reaching $50,000 in savings may not take as long, but if you've reached that milestone, congratulations are in order. But now that you've saved the first half of a healthy $100,000, it's the ideal time to evaluate your savings goals and make sure you're on your way to your dream retirement. Keep reading for 10 tasks you should tackle as soon as your 401(k) balance hits $50,000.