How To Unlock Master Of Stealth TrophyYou need to beat the entire Memory Sequence 11 without being seen even once. After each checkpoint, the game will inform you if you’ve been seen. Look at the “Times Seen” counter – if it’s not showing a zero, you need to restart the level.
If you enter even one enemy’s cone of vision, you’ll need to restart the checkpoint, even if it only turned yellow. Kill only when you have to – approaching enemies puts you at risk of being detected. Avoid using throwing knives – as soon as they hit, you’ll be spotted. Noise darts are OK – use them to distract enemies.
Here’s a video showing the sequence being completed without being spotted: