Claim to fame
Definition 1 of 1
Pro Tip 1/3Not Always Positive
Someone's claim to fame can be unexpected or trivial, not always prestigious or admirable. 
His claim to fame was being the loudest snorer in the hostel.
Pro Tip 2/3Can Be Past
The phrase often refers to past achievements or records that no longer hold. 
Her claim to fame was winning a national chess championship as a child.
Pro Tip 3/3Irony Usage
It can be used ironically to mock something that is not very impressive. 
His claim to fame is eating 50 hotdogs at once, if you can call that fame.