Most Areas have obvious alternate paths (especially vents). I went through the game using primarily Takedowns, the Stun Gun, TESLA, and the EMP10mm pistol (swapping between them but the first 3 all do the same job more or less). Augments: Energy Upgrade (VITAL), Hacking Tier Upgrade (VITAL), Jump Upgrade (VITAL), Tesla (optional), Glass Shield (optional), (Remote Hacking (optional and handy). Pick-up Weapons: Tranquilliser Rifle, Stun Gun, Any weapon with EMP rounds (optional), EMP Mines. You need to focus on using the following equipment: The first and most obvious tip is to SAVE.
The game isn't very long compared to Human Rev and doesn't offer many new challenges, so if you've beaten the last game this should all be obvious to you already. This guide is not a step-by-step tutorial because I feel that these tips are easily enough to help you beat the game regardless of skill-level. In order to get this achievement you need to go through the game completely non-lethal.
