/script ChatFrame1:AddMessage("\124cffffff00\124Hachievement:4531:01800000013C2F37:1:1:18:9:4294967295:4294967295:4294967295:4294967295\124h[Storming the Citadel (10 player)]\124h\124r")
Paste that into chat, then it will pop up and show the achievement, and then you can link it as though it is your own. It will claim you completed it on the 18th of January 2009. There's your ticket into ICC/ICC rep farms! lol.