Need to Know Achievements Here is the full list of all 10 Need to Know achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.Filter Achievement View View Image viewList view Sort by TrueSteamAchievement desc TrueSteamAchievement asc Achievement name desc Achievement name asc TSA Ratio desc TSA Ratio asc Gamers desc Gamers asc Steam order Date won desc Date won asc Flag Filter All None 10 Offline Mode 10 Single Player 10 Main Storyline Link flagsOR joinAND join Achievements without these flags What are achievement flags? Click to find outApply On ProbationReach Clearance Level 10. Still HereReach Clearance Level 9. The InsideReach Clearance Level 8. Clearance Level 7Reach Clearance Level 7. Clearance Level 6Reach Clearance Level 6. Clearance Level 5Reach Clearance Level 5. Clearance Level 4Reach Clearance Level 4. Clearance Level 3Reach Clearance Level 3. Clearance Level 2Reach Clearance Level 2. Clearance Level 1Reach Clearance Level 1.