Via GuildOx, we have another big raid achievement coming down the pipe for Premonition of the Senjin-US server, who probably needed a boost after that horrible wipe to Hogger at BlizzCon. They've just grabbed the 10-Man Tribute to Mad Skill achievement, which means they defeated the 10-man Coliseum raid on Hard Mode up through and including 10-man Anub'arak with less than 5 wipes over the entire time.
Premonition has established itself among the solid lead US guilds before, having also been the first US guild to get Heroic: Alone in the Darkness by killing 25-man Yogg-Saron with no watchers. It looks like they're poised to continue that streak now that all the bosses in the Coliseum are unlocked. Congratulations to them, and good luck in the future!
Update: We're attempting to verify this through other means at the moment. Hold onto your pants! -Alex
Update #2: Confirmed.