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Rockstar confirmed that this one wasn't viral and it's only just been released on Rockstars end because the developers have only just started playing it online. The 8 members of the development team who can issue the achievement have been under strict orders not to play any ranked games until a certain date.
However, on their developers night that was recently held it was temporarily viral so that you could get it by killing someone who has the acheivement already. Whether this is still the case I'm yet to find out but I don't think it will be considering it was changed for that particular event.
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Congratulations, you got one of the easiest achievements on the game :)
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After I posted in this thread I got the achievement from killing someone in a gta race with grenades xD
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I think its now totally viral, as in permanently, after doing a bit of research on it I decided to go for it to see if I could find someone with it (assuming only higher ranks would have it). First ranked deathmatch, first person I killed, it unlocked.