It seems you're making it sound harder than anticipated. For the BG one, simply queue up for Arathi Basin battleground. When you get in, just walk to the black smith (middle of map). Go indoors place fool down and pity it, then leave (track the achievement to make sure it comes off your list, and the mini map should say "Blacksmith" when you do it). Chances of you getting killed during this time is minimal or highly unlikely. Also, for the Winter Veil one, although late now, it says you need to do 50 kills while in the elf costume. I'm not sure if you're aware, but you don't need to do the kill yourself. How I did the achievement (without dying) is simply queueing for Alterac Valley and just hanging with the bulk of the large group doing some AOE attacks, while everyone else gunned the opposing faction down. To put it bluntly, I leeched while providing minimal damage to not attract attention, and hanged near healers.
For naxx, do you not have an idle guild friend that would let you group with for literally just 1 min? Simply head to Naxx, hang outside, ask if you can invite someone in guild, make raid, go in, lay fool, pity, run out, done. Apologies in advance if you're not actually in a guild. Otherwise, a workaround would be to queue for Wintergrasp and *pretend* to do something (so no one reports you). When it ends, you will still be in a raid group regardless, and fly out to Naxx.
I do however, agree with you that given the easy nature of this game (nowadays), people are still even more extremely lazy. It's easy to get to dungeons. It's easy to craft. It's easy to farm. Why is getting something so simple done so hard... lol
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