Tom Clancy's Splinter Cell HD

This trophy requires you to go through the entire game without ever sounding an alarm. Levels that are focused on Assault rather than Stealth do not have an alarm to worry about. These include the Oil Rig and Kalinatek missions. Being spotted by an enemy and having the music change is not an alarm. It’s when you hear an alarm sound and it’ll come up with a warning that you’ve had 1 of 3 alarms allowed for that level. Some only have 1 allowed. So if you get that warning, or you hear an alarm, it means this trophy has been disabled.

You can reload your save however, and the alarm will not have sounded and you can still unlock the trophy. So just stay aware, and if you hear an alarm, then reload your last save. Remember, you can make a save whenever you want so make use of this. On levels with alarms, always make sure you hide bodies well in the shadows. Shoot out lights and turn off light switches when you can as in this game darkness is your key to survival and also your enemy’s weakness. If a body is in shadows, it wont be found and an alarm will not go off.