One member of our team did some checking on GuildOx, which is a Guild Ranking site.
Heroes Inc is the 5th guild on Altar of Storms to get Heartbreaker, but the very first Alliance guild (according to this site). We never set out to get an Alliance or Server First, but that's pretty cool.
We continued our run and downed Auriya, Thorim, and Hodir. We'll need to get Freya, Mimiron, and General Thursday to give us another shot at Yoggy on Monday.