Salt and Pepper (25 player)

This is considerably harder than the 10 man version. The shared health pool in 25 man is 4.8 times as large as in 10, but not nearly that many more dps'ers.

Assuming the 2 tanks do 1.8k dps each we have

27,980,000/180=155,445 (rounded up since you can't go over on time and get it)
151845 raid dps from the non-tanks. With
4 healers-->151845/19=7992 dps average per dps'er
5 healers-->151845/18=8436 dps average per dps'er
6 healers-->151845/17=8932 dps average per dps'er
While there are damage buffs, this would have to be the average dps of the non-healers, non-tanks.

EDIT: Why would someone downrate this? It's simply presenting what numbers are needed for the achievement....

Pretty easy to solo in Warlords. Just burn one down, then both fall and you get the achi.

I can confirm that you need to wait a bit before killing them to get credit for the achievement. As of TWW I would recommend to aggro the boss while buffed with the Whole-Body Shrinka Toy, do a few auto attacks and then just nuke the boss to get the achievement!