Being good at PvP in any Souls game. I'll likely never replay any entry enough times to reach their final NG+ mode either.

Being good at fighting games, I'm not bad, but I don't have the love and tenacity anymore for the genre to ever be as good as my friends.

I'll second FFIX's jump rope minigame. Just doesn't seem worth it.

Finishing any of the stupidely hard modes in a DMC game. I tried for the first game, but I've never felt the need to bother afterwards.

That's all I can think of at the moment.