Start the game on easy difficulty and make sure 'Operation Progeny' is enabled under advanced options. If you're an experienced XCOM player, then feel free to do that, but I would recommend playing through the game twice. It is possible to complete all of the achievements in a single playthrough, however this does require earning every achievement on classic difficulty. Unobtainable/glitched achievements: None To get ' Army Of Four' you must play on classic difficulty Does difficulty affect achievements: Yes. Minimum number of playthroughs needed: 1
Approximate amount of time to 1000 : 30 hours Estimated achievement difficulty: 4/10 for 900 7/
