I just completed a Witch of the Swamp adventure, and was doing all the achievements in 1 adventure
I completed all the other achievements but did not get the Overkill achievement.
I didnt send 1 single soldier to the adventure, whats gives.
Not a good start to a new achievement system, i might wait a while, as i don't want to be doing the harder achievements,
if im not going to get the credit for them