Thanks to DieH@rd.
Display Options
Each of these can be turned on or off individually based on your preferences:
 * Navigation prompts
 * Interaction prompts
 * Waypoint markers
 * Threat icons
 * Threat health meters
 * Mini-map
 * Mini-map rotation
 * Reticle feedback
 * Journal updates
 * Pick-up notifiers
 * Light gem
 * Object highlight
 * Loot glint
 * Lockpick helper
 * Frame search helper
 * Garrett narrated hints
 * Health meter (on, off, or fade over time)
 * Focus meter (on, off, or fade over time)
 * Ammo counter (on, off, or fade over time)
Custom Difficulty Settings
You can create your own custom difficulty level by toggling on any (or all!) of the following mods:
Base difficulty: easy, normal or hard
Classic Thief Mods
 * Chapter Save Only: manual saves and checkpoint auto-saves are disabled.
 * No Focus: the use of Focus is completely disabled and no Focus Points are earned.
 * Stealth Takedowns Only: you cannot perform combat Takedowns and Takedowns from above.
 * No Reticle: no aiming reticle is displayed when drawing the bow.
Legendary Thief Mods
 * Specialty Arrows Only: only Blunt, Water, Fire and Rope Arrows are available.
 * No Resources: food (health) and poppy flowers (Focus) are not consumable.
 * It Hurts Not: if you take any damage, the mission is failed.
 * Expensive Tools: the cost of arrows, tools, food and poppies is greatly increased.
 * Slowed Movement: running and walking speeds are reduced.
Ultimate Thief Mods
 * Iron Man: if you die or fail a mission, you lose your game and must restart from the beginning.
 * No Upgrades: non-critical upgrades are disabled.
 * No Kills or Knockouts: if a human or animal is killed or stunned, the mission is failed.
 * No Alerts: if a human or animal detects you, the mission is failed.
PC version [made by Nixxes] also has TrueAudio [precise audio positioning of every sound source], Mantle rendering path, native 3D rendering, support for Eyefinity and glorious FOV slider.