The interviewer asks this question to gauge your ability to overcome challenges. As an electrical lineman, you've likely faced many obstacles in your work, and the interviewer wants to know how you handle them. Be honest and specific about your experience, and highlight the skills you developed in the process. This will demonstrate your resilience and problem-solving abilities, which are essential qualities for anyone in this field. Remember to focus on the positive outcome of the accomplishment and how it has helped you grow as a professional. Being able to face a challenge or difficult situation and still gain achievement in the end is incredible. Talk to the interviewer about a time when you were able to come out on top despite being faced with an obstacle.