Hi, thanks for reporting this. We're looking into it. All achievements had been tested and confirmed to work, apparently there are specific conditions under which this achievement does not get triggered after all. Odds are that it will be triggered next time you play the level but we'll see how we can make sure it gets triggered every time it should. Very glad to hear that. :)

Thanks for looking into it.

Basically what I did was:

I freed the Childeater, by intimidating the one guarding him, and then I went with another character to the telegraph to destroy that. This caused the guy guarding the telegraph to get aggro and start combat.
I quickly dispatched of all enemies I had in direct sight and then went for the bank. The bell rang and it was stated that the signal was done and the devils where on their way.

Maybe it was because the combat start happend quite simultaniously with the destruction of the telegraph because I didn't see the guy guarding it and just "activated" the telegraph ignoring him.

Finished a couple more scenarios and I am still very pleased with the game, so thanks for making this game!
I did not manage to unlock all specials in some scenarios and it keeps me guessing what I missed. :D