It's confirmed, it works!
I've just got the game today, and gotten all the achievements. Luckily I saw this post before I got the 100 explosion kills achievement, and decided to test this out. Well after a few minutes of luring the monsters to the bombs and letting them set it off, I unlocked the acheievment
Hopefully this information will help those high levels who keep killing the monsters by mistake while meaning to set off the bomb!