[fxtentacle]

Most people that you meet are so concerned about what you think about them that they'll barely spend a thought on what they think about you. So if you get bad reactions to showing your achievements, the problem might be that the other person feels like you are diminishing them in comparison.

From my experience, the trick is to always focus on the emotional side of things. If you say that you feel super happy because project X worked out as planned, the other person can easily relate to that by telling you about their project Y that worked out well.

You might not understand (or care about) the details of each other's achievement, but the emotions why you enjoy talking about it should be pretty much universal.