Get to set 7, round 7, wave 7 of Firefight on Legendary. /EDIT: Apparantly a troll started this rumour on the forum, it's false, I believe. /
I can't post the link to the topic, but it's a popular halo modding website, most of you should know it.
Anyway. I'd take it with a grain of salt until proven otherwise, but it does sound like a tough achievement...
So...let's start speculationg up ideas for some vidmasters.
Vidmaster : Gorrila Man - Kill 500 gorillas. [lolwut?]
Vidmaster : Blame Stosh - Die in campaign on Easy mode [ROFL!!!!!!!]
Vidmaster : Two Things at Once - Make a topic on bungie.net the exact same minute you win a game on halo 3 odst
[Edited on 06.19.2009 7:08 PM PDT]