I think achievement is a good idea, but i hope they implement a mode for people who wants a challenge where flee and teleport cannot be abused, this can improve the game replayability and epicness. I really think they should also be actively trying to patch/balance things up since this flee issue is really makes the game a cakewalk! The "Honour mode" can also be easily abused if one flees every single encounter after killing one mob, and come back to rid the rest. Give the casual and challengers different game modes so they are both satisfied. I really support Larian studios and hope this game sells!
Gamers who are up for a more challenging Divinity experience, feel free to post on this thread!