There are three achievements in Fight Night Round 4 for reaching the highest rank on the leaderboard for the specific weight class of your fighter. So, technically, the game expects you to beat one of the three current best players of the game to get this achievement. Good luck, achievement junkies!
Also, not necessarily as irritating, but somewhat perplexing, Skate 3 has an achievement called "It takes a really big village..." which requires the online community to reach a certain target on their progress. Not difficult, but it basically handed out a free 50-point achievement to me when I started the game up for the first time six months after its release, so the idea of mutual cooperation of all who puchased the game was lost on me.