About the Backstabbing Traitor achievement

[mckwack]

I thought that, betraying escort to Ziggur is part of the requirements to get the 'Backstabbing Traitor' achievement. But when my rune-less magic-less character betrayed one to Ziggur, I noticed that it was counted as a 'saved escort' point and contributed to the 'Guiding Hand' achievement instead.

So I deduced the followings on how to achieve escort-related achievements:

Guiding Hand: safely escorted an escort to the portal; either 'normal escort' or 'betray to Ziggur' counts
Bad Driver: got all escort killed by something else beside myself
Backstabbing Traitor: got at least 6 escorts killed by myself

Is that about summed it up? Tried to search the forum but came up empty..