I was pretty lazy about heroic achievements at first. Too many people needed frozen orbs for their resist sets, or badges for gear, and the general consensus in most groups (whether they were pugged or guild runs) was that achievements would be great to have, but not really worth going out of our way to get at the time. Why spend 3 miserable hours trying to get Watch Him Die, we reasoned as fresh 80's, when we could finish Azjol-Nerub and do 2 or 3 other heroics in the same time period?
With better gear, some free time on our hands, and the siren call of a cherry-red drake, heroic achievements became less an afterthought and more an interesting challenge. The odyssey's been an education on the limits of the otherwise admirable mantra "Bring the player, not the class" (does said player bring Bloodlust?), how much DPS you can squeeze out of your tanks and healers ("Smite harder!"), and the welcome role that luck often plays. I am ashamed to admit that Less-rabi, one of the most difficult and frustrating hurdles of Glory of the Hero, was accomplished because yours truly can't tell the difference between her Maul and Bash hotkeys in the heat of the moment. Accidentally interrupting a 0.4-second cast ability within a tenth of a second is going to go down as one of the great Fortunate Fool moments of my tanking career. My friends, if you're working on heroic or raiding achievements, whether casually or seriously, I wish you that kind of dumb luck.