Rescued a princess, helped deliver the DS plans to the rebels. He did blow up the first Death Star. Got a medal for it too. If he never did another thing after that, he would be a legend.
The shield generator mission might have not succeeded without Han being there, or Luke making the Ewoks into allies.
I’m sure 30 years on, the stories about Luke have been retold over and over to the point that they only bear passing resemblance to what actually happened.