You can complete the entire game with "Ghost" (never seen) and "Clean Hands" (no kills) status, or engage in "High Chaos" through brutal combat.
According to System Requirements Lab , the hardware needs are as follows: Recommended Intel Core i5-2400 / AMD FX-8320 Intel Core i7-4770 / AMD FX-8350 RAM GPU NVIDIA GTX 660 (2GB) / AMD HD 7970 (3GB) NVIDIA GTX 1060 (6GB) / AMD RX 480 (8GB) Storage 60 GB available space 60 GB (SSD recommended) Game Length Based on data from HowLongToBeat : Main Story: ~12.5 hours. Completionist (100%): ~46 hours. Dishonored 2 - GOG.com Dishonored 2 v1.77.9-GOG
This version includes the New Game+ mode, allowing you to carry over runes and traits from previous runs and even mix Emily and Corvo's powers into a single character. You can complete the entire game with "Ghost"