This can either be seen as easy or hard depending on the play style of the player, as there is a limited Heads-Up Display, ammunition is limited and enemies do massive damage. Playing the game on this difficulty demands a more stealthy approach to the game - going in guns blazing will most likely get you killed quickly. This is most definitely the case on levels where Artyom is fighting human enemies and even some where he is on the surface (Bridge and Sundown are notable). Simply loading the last level and setting the difficulty to Ranger Mode Easy will not give you the achievement/trophy; you must select new game from the main menu, and select Ranger Easy. However, completing the game on Ranger Hardcore will unlock both this and Survivalist.