So i got the achievement yesterday in a stupidly easy way.
I was doing this warehouse in Nassau... so i kill the guy with the key and start getting chased by some dudes, i run across the Restricted area and then climb the tower, so all the guards start climbing the ladder as well. so when 2 climb up i kill them / kick them down and I keep doing that while more guards climb up the ladder.
And then i just got the achievement. .. I wasn't even trying and i got it. so I thought i should share it because i see some people having trouble doing it.
2 camels in a tiny car... RWJ anyone? No? oh, ok...
That's awesome! I got it while boarding a ship. Normally I have trouble with that kind of thing because my kill streaks get interrupted. What I am having trouble with is the kill 5 guards who are stunned by smoke bombs one.