I agree with Alvin. there are probably achievements you have that you can be proud of that you haven't recognised or cherished. They don't have to mean much to the world. For me, my greatest achievement to date is still completing my bachelors. Because it tested me to the hilt of how I can get out of the worst scenarios (even if I screwed up and created said scenarios
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You should reflect on your life, maybe make a timeline, and list your achievements and the strong points in your personality that helped you make it through. It's a real morale boosting excercise. Ask your wife - she's probably been a witness to most of the things you're looking for.