You may accomplish them all on any difficulty setting you choose (and you may change the setting at any time).Ī note on Easy Difficulty - Corvo does not need to be in 'sneak mode' to choke or stealth kill enemies on Easy (he can be standing up as long as the NPC is not aware of him, he can initiate either action). There is no difficulty requirement for any achievement.
the secret achievements) can be accessed easily by maintaining a comprehensive Save History to access different points of the campaign. Alternately, you can risk shooting the NPC with a Sleep Dart (resulting in a massive swarm of rats) but that will immediately disable the NPC and prevent it from respawning a version that can detect you. One choice will always brand you as a killer, but incur no alerts the second choice easily results in no fatalities, but it may be extremely difficult (if not impossible) to evade detection (unless you use Bend Time at maximum level at the right moment). Beware that in the mission Flooded District, Corvo will need to make a mandatory decision between two NPCs.This naturally, will disqualify you from Clean Hands. Killing enemies is an option, so you may find the occasional stealth kill using a crossbow very helpful. For Ghost and Faceless, you cannot be spotted at all (the Metal Gear Solid Stealth Syndrome).
