The third ending, in some ways, is also what we consider as the true ending or secret ending. We discuss all the details in our Tweed’s Revenge guide, but here’s what you need to know:

• Complete the Tweed’s Revenge mission by finding evidence of Alta’s wrongdoing. You need to scan 13 specific objects in total across multiple planets.
• You can also push back against Alta’s “Nastygram” threats by taking out targets in your base in Nu Florida.
• Launch the Javelin after gathering all the evidence for Tweed. This nets you the “Revenge Is Best Served via the Internet” achievement.

The Javelin launch cutscene plays normally, but that’s followed by a Tweed telling you that he’s ready to sue Alta InterGlobal. Later, when you return to your hub, a newscast informs you that Alta’s higher-ups have been imprisoned thanks to Tweed’s exposé.

In any case, that does it for our guide on how to get all Revenge of the Savage Planet endings. If you’ve done all the aforementioned tasks, then you’ll also receive the “Side Notes” achievement for completing all core side quests.