I've finished it on my main group, but here's something to remember:
It's about #s and nothing else.
We did a few near instant respawn zones and, at times, had well over 2K corpses. TURN ADVANCED LOOT OFF OR YOU WILL CRASH.
This is an extremely easy achievement for a guild to get - make a raid (can have up to 72), everyone spread out in the same zone and designate who's killing what. The whole thing can be done in < 1 week. The few that are trickier are killing gods and dragons. My fav place to do this is PoTime for gods - too many good places places to count dragons. Some of the old school drops are actually still useful - kinda.
PoP elemental zones are decent too, but far too often someone I'm with screws up and their repost kills the last respawn mob.