In level 11 of Mark of the Ninja one of the challenges is to kill 5 enemies with traps. I killed more than 5 using environmental traps, but I saw no progress indicator nor did I get the challenge complete or even a challenge failed notice. Is it glitched or am I missing something here?
I got this one with no trouble, and I saw a status update for each one.
For the most part, I knocked the bombs down using darts, and then attracted a guard/stalker's attention with another dart to get them to walk over it. I believe these were the "Indirect Kill" type when they were scored.
According to some feedback left in the comments, this particular challenge only counts when you're in the "bandit" section of the level. There are some challenges that are specific to sections of a level, and typically you'll get a "New Optional Challenge" alert when you're in the right place for this.