How do you beat the lifeline quest in James Cameron's Avatar the game?

To beat the Lifeline quest in James Cameron's Avatar: The Game, focus on completing the objectives that involve rescuing the Na'vi and defending key locations from the RDA forces. Utilize stealth to avoid detection and take out enemies quietly when possible. Make sure to gather resources and upgrade your abilities to enhance your combat effectiveness. Finally, cooperate with NPC allies to maximize your chances of success during combat encounters.