Overview: These achievements are unlocked by progressing through the main questline and completing the game with different faction endings.
- 'They Went That-a-Way': Completed 'They Went That-a-Way'.
- 'Ring-a-Ding-Ding!': Completed 'Ring-a-Ding-Ding!'.
- 'The House Always Wins': Completed 'The House Always Wins' (any part).
- 'For the Republic': Completed 'For the Republic' (any part).
- 'Render Unto Caesar': Completed 'Render Unto Caesar'.
- 'Wild Card': Completed 'Wild Card' (any part).
- 'New Vegas Samurai': Completed the game with the NCR ending.
- 'The Legend of the Star': Completed the game with the Independent Vegas ending.
- 'Ave, True to Caesar': Completed the game with the Caesar's Legion ending.
- 'The House Always Wins': Completed the game with the Mr. House ending.
Strategy: To unlock all ending achievements, you'll need to play through the game multiple times or create multiple save files at key decision points.