This achievement requires that you finish the game on Trailblazer difficulty. This must be set when you start a NEW game. On this difficulty, things don't sparkle or flash and hints and puzzle skips are disabled, making it more difficult to figure out what you need to do and complete the game. Use the walkthrough provided in the story-related achievements of this guide if you are stuck. You can also open up the Strategy Guide (if you have the Collector's Edition) at any point which will help guide you along or for puzzle solutions. Using the Strategy Guide does not affect any achievements. After completing the game from start to finish on Trailblazer difficulty, the achievement will pop as the credits begin.