[quote name='Azumangaman']DOA4 is pretty dang hard, mostly because I can't ever get silver or higher in surivival (gold or silver) and Time Attack Single Medals are impossible (I have all the tag medals). As for costumes, most of the characters can be done through Story mode. I've got all THOSE costumes (you can find lists of which characters have how many costumes). The hard part about all costumes is unlocking the secret characters costumes because you have to do Time Attack mode (which is hard) and that takes forever.[/quote]
see, now doa4, not hard to me. granted, i only have 700+ pts. on the game, but still not hard. just need patience.
i guess the way we would define hardest achievements falls under the categories of patience, online ranking, glitched, or amount of dedication for being cheap, not hard
my biggest gripe is the fact that you may have to cheat in order to get some of the online ranking achievements. saint's row comes to mind, as does quake 4