Formed a guild after only playing WoW for 4-5 months. Took a group of 5/12 ICC players on to kill the Lich King at about world rank 100,000 which felt EPIC at the time.
Scored a full Realm 1st clear of Dragon Soul normal (this wasn't really that amazing, and it was normal mode, not HC, but at the time...it felt amazing). Sat on Realm 1st on Wowprogress for a full week, coming from previous realm rank 25th or something? Felt like gods. Also scored realm 1st Morchok HC and then finished the tier in 15th lol