1. Hire a good developer with a real passion for the franchise (not Shitbox)
2. Keep a constant eye on them to prevent anything like the A:CM outsourcing and money-siphoning from ever happening again.
3. Leave Hadley's Hope and LV-426. Do a desert planet, a jungle planet, ice world... ANYTHING besides Hadley's Hope, again.
4. Hire good writers (hell, even decent writers)
5. No-more tie-ins to the Sulaco crew
6. Make it so that you can customize your character in the game and you take him with you from single-to-multiplayer.
7. Keep the hype minimal, show real gameplay.
8. Truly immerse ourselves in the world of Aliens like A:I did for Alien.
Really, just do what Alien: Isolation did in terms of not f**king things up.