It will take some time, but it is BNS gold possible. The more people there are, the faster it will be completed.

The reason I am doing this is because I value achievement completion. However, there is a massive downside to this particular achievement in that, whenever you switch factions you lose all progression in your BNS gold faction rank and you will have to leave your guild. Not only that, but you will have to wait 7 days before you can switch back to a faction you have left. That's 7 days you can't be in your actual guild.

The purpose of starting on the opposite BNS gold faction is that I can do my 1,000 kills and then switch to my preferred faction without having truly lost anything important. I can do the kills, switch to my preferred faction immediately and start helping out my guild.

The benefit of trading them in a party is that you can resurrect the people much faster after you down them. This will speed up BNS gold the entire process greatly.