So I decided to go back and complete achievements for Halo Combat Evolved and I have came upon a bug in the mission Truth and Reconciliation. The bug is with the achievement 'All According to Plan' in this achievement it states: Halo CE: Kill the first group of enemies on The Truth and Reconciliation without being detected. I have gone through this mission many times on different difficulties from East to Legendary and I even tried it on LASO, but in all those attempts that easily ranged over twelve hours of my life the achievement has still not unlocked. Bungie I am really disappointed in your game design and how you have not attempted to fix this bug. It really upsets me, because Halo Combat Evolved is the best video game ever and is the only video game I play nowadays. I play this game day after day and it has become an addiction, but the game is really amazing and I love it. It would be really grateful to have your assistance with this problem.