In the Star Wars Holiday Special, Darth Vader says this to Boba Fett:
I see why they call you the best bounty hunter in the galaxy.
This seems to be the general attitude of most characters towards Fett. It's also common to hear fans describe him as the greatest bounty-hunter in the Star Wars galaxy.
However, in the actual films, he doesn't do all that much. He helps capture Luke and Han, which was impressive, but not really enough to justify being called the best bounty-hunter in the galaxy.
What exactly has he done in the expanded universes to deserve this title?
I'm not asking for arguments as to why he is or isn't deserving, what I want is a list of his greatest and most impressive canon bounty-hunting accomplishments.
Edit: I know he was a powerful fighter who did many impressive things. However, if it isn't bounty-hunting related, it doesn't answer the question.