Hidden and dangerous achievement in Sniper Elite 3 (Xbox 360)

How to unlock the Hidden and dangerous achievement in Sniper Elite 3 (Xbox 360): Complete a campaign mission without being seen (excluding Tobruk)

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Sniper Elite 3 - Hidden and Dangerous Trophy / Achievement - Complete a Mission Without Being Seen

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Sniper Elite 3 - Hidden and dangerous Trophy / Achievement Guide

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Hidden and dangerous Achievement in Sniper Elite 3

Sniper Elite 3 - Hidden and dangerous Trophy / Achievement Guide