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Gamerscore: 60G
Achievement Description: Completed 10 rooms without raising an alarm.

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Complete 10 sections without being noticed. This includes enemies discovering corpses and becoming hostile regardless whether they spot you or not. If you successfully complete an area without raising alarms at the checkpoint you will get bonus xp for it with a message on the top right corner of the screen.

As it does not need to be 10 different levels, you can use an exploit and replay the last checkpoint of a relatively short and easy area again and again. The video guide below explains it all. Remember, you still need to complete a whole area without triggering alarms, you only exploit the fact that you get the bonus with the last checkpoint in that area.

Another tip is to use the section at the very end of chapter 3. You'll walk into a big room with the man playing the piano. Get to where you can just say "enough talk," and choose that option. You will notice the "no alarm" bonus come up, even if you had previously been caught by the group of enemies before the room. The correct loading name is your latest save of warhouse.