What achievements / items make you happiest?

..even if they weren't that obscenely rare or difficult to get. We all have those one or two achievements or items that have history / nostalgia, will you be my friend and share with me?

I'll start. I am very fond of my "For the Horde!" achievement and the Black War Bear mount, it was a ton of fun to get and the thing looks really cool. I will also always be partial to my Anathema.