3School of Hard Knocks
Two things you need to know about first -- orphans and battlegrounds. Orphans are non-combat characters that you can have follow you around during Children's Week, a yearly event where you take an orphan around with you to see specific sights in the world that they've always dreamed of seeing while confined to the orphanage -- sights like the Dark Portal where the orc invasion entered the world, or like a dam or something. They say malnutrition does strange things to a growing brain.
Doesn't do much for looks either.
Then we have the battlegrounds, which are specific player-vs-player scenarios with goals like capturing the flag or holding bases or whatever, and involve players killing each other en masse.
So what better things to put together than orphans and battlegrounds? It's like peanut butter and jelly, it is.
"MOTHEERRRRR! NOT AGAIN!"
Every year during Children's Week, people who don't normally play PvP will flood the battlegrounds, hoping to accomplish these very specific and non-teamwork-oriented goals while toting an orphan around, enraging the PvP veterans who are trying to, you know, win the battleground.
Also, for some reason, 15 orphans goes from cute to creepy.
2Insane In The Membrane
Cypress Hill! Ha ha! Remember, like I said, just sigh and move on here. This achievement means you've raised your reputation with the 8 most useless factions in the game. This is how factions work:
(1) Blizzard installs them as an official faction in the game, which means they get a name and a little progress bar in your reputations page.
(2) Blizzard implements some things you can do to improve that reputation, like quests, or items you can turn in, or something.
(3) Blizzard creates rewards that you get for having a certain reputation level, and puts a quartermaster in the game you can buy these rewards from.
There are a few factions in the game where they basically got to step 1, then when it came to step 2, implemented one thing you could do to increase that reputation, and then forgot about adding any more, and just really never got around to step 3 at all. So the lack of attention to step 2 means you can only increase your reputation at a snail's pace for those factions, and the lack of a step 3 means you get nothing for doing it except people shaking their heads sadly at you.
So the developers thought it would be funny to give out an achievement for getting max reputation with all of these factions, which one person has calculated would take approximately 360 hours of playing time, time that can't be spent killing bosses, getting gear, or achieving any game goals, never mind time you could spend with your family or exercising.
In return, not only do you get the achievement, but also a title that can appear at the end of your name.
So yeah, totally worth it.