Last Man Standing

Complete the game on Ranger Mode Hardcore - the toughest achievement here. No HUD, no crosshair, no ammo or objective indicators, brutal scarcity of filters and ammo, and everything dies fast (you included). Play slow and stealthy, conserve every round, lean on throwing knives and stealth takedowns to save ammo, grab every filter, and learn to read the environment without the HUD. The harder-hitting weapons mean stealth kills are usually one-shots, which is your friend on a careful run.