Question on "Foxiest of the Hounds" achievement

[Anthony45654]

The description for the achievement says "Complete Deus Ex: Human Revolution without setting off any alarms". Does that mean even if the enemies become hostile, as long as they don't sound the alarm, I'll be able to get the achievement? I think I'm almost done the game (at least it looks like it) and the enemies have turned hostile a couple of times but the alarm itself has never gone off so I'm not really sure if I'll be able to get the achievement.