Record: # of wins , losses, draws, and NCs.
Statistic: Numbers based and factual. Things like, # of title defenses, # title fights, # weight classes titles were held in, win streak, # of finishes, etc.
Accomplishment: Usually denotes that a fighter has the most, many, few, fewest, or none (whichever is more desirable, given the context) of a given stat. e.g., most knockouts is good. Having never been knocked out, also good. Statistics are the basis for claiming that something is an accomplishment. Although, this can also be subjective. Sometimes, the fact that a fighter even showed up is an accomplishment, although not backed by a statistic.
Superlative: An exaggerated or hyperbolical expression of praise, frequently overused by Joe Rogan. It is subjective and opinion based, although accomplishments and stats can be used to support a given case. Things like GOAT (except in the case of Fedor, which is objective), most dominant, toughest, most heart, most entertaining, etc.
A fighter's resume could include a combination of all of the aforementioned metrics.