Seriously, this is stupid-simple. Keep the flaming out.
Find a paladin and ask them to cast Hand of Protection on you.
Now jump off somewhere high, such as the Aldor/Scryer elevator, Telredor, anything like that will do. You now have your achievement.
I've been doing this on my server for my guild mates. In theory, you could "sell" the achievement, say, 4-5 gold per person? Hand of Protection has a 5 minute cooldown (Might be less if you are prot spec, dunno, I play ret now.), that that = ~60g an hour. I know it isn't much, but hey, its free.
I do not want to hear your flaming, or how "Everyone knows this, why bother posting it", blah blah, etc. This is posted for the large amount of people who don't know it.
Thank you.