What I did try :

- teleporting out:

- with expensive artifacts previously sold to shopkeeper
- with items generated inside shop, sold for more than 7k (some sold for more than 100k)

- stealing (Thief class)
- expensive artifacts previously sold
- items generated inside shop, some sold for more than 150k (casino) - doing this awarded Ocean eleven achievement, but not Avatar of thieves.

- killing shopkeeper


Did not get the achievement.
Could someone take a look at it please?

If someone got it, could you tell me exactly how to do it? For example - which artifact, which shop?
The wording of the achievement is pretty clear (might me a trick, however - is there a secret internal item value that cannot be observed and none of my 30 high tier artifacts does score 6666? Would be very weird )