Overview + Estimated achievement difficulty: 6/10 (depending on Tekken ability) + Approximate time: 96 hours for 1,000 + Offline: 45 (900) + Online: 5 (100) + Minimum number of playthroughs needed: Roughly 1 For Enemy Hunting Master and 1 for Arcade. + Number of missable achievements: 2; No Key for Me (45), Alien Hunter (20) + Glitched achievements: 0 + Cheats: No Cheats (1 Play... more.