I've just finished Deus Ex: HR on PC. According to Steam statistics, I've played the game for over 60 hours. Even though I did take my sweet time exploring every nook and corner, and hacking everything to be hacked, Steam data is surely wildly inaccurate, as usual. Sadly, Steam client doesn't make any distinction between you actually playing the game and going away from PC for an hour or two (or even a night).
There are two infamous achievements to be gained in HR, Pacifist and The Foxiest of Hounds. An enormous amount of people seem to misinterpret the description the game provides for the latter. It clearly states that you have to avoid setting alarms on your playthrough. It couldn't be any more clear than that. Still, a lot of people aiming for the achievement make a great effort to go though all the levels without being noticed or heard at all. Probably developers could be blamed for that, if only a bit. Every enemy can have a state called "alarmed". It's a perfect word to describe the condition when an enemy thought he saw or heard something. It doesn't mean that you've been spotted - even Ghost XP award can be gained if you had a bunch of "alarmed" conditions triggered. There's a world of difference between alarming an enemy by any way possible and setting an alarm. They do mean alarm systems, not a condition.
Anyhow, I don't care for achievements as I used to, so I just played the game as I liked. Still, my playstyle went hand-in-hand with the requirements for the two aforementioned achievements.
to be continued...