Fallout: New Vegas
75 Achievements
112-136h
All or Nothing
Complete All or Nothing.
10.3%
How to unlock the All or Nothing achievement in Fallout: New Vegas - Definitive Guide
To get the Achievement All or Nothing, you will have to complete the game aligned to Mr.House. After fighting your way through Hoover Dam you will have to go to Legate's Camp. After killing or convincing Legate Lenius to surrender and then shortly after killing or convincing the NCR military leader to surrender <-- (You will need to have 100 speech for this). Mr.House will come up to you and declare that you have won the battle for him, after the short conversation with Mr.House the achievement All or Nothing will unlock.
If you are having trouble with the quest All or Nothing head to this link http://fallout.wikia.com/wiki/All_or_Nothing .
All credit goes to Fallout Wikia for the walk through of the quest.
This achievement is unlocked after you complete the game by allying with Mr. House at the Battle of Hoover Dam. Check here for a detailed walkthrough.
Main quest ending supporting Mr. House. One of four mutually exclusive ending trophies.
The ending missions are very straightforward. "All Or Nothing" requires you to install a override chip in a control box in Hoover Dam, activate the East Power Electrical Switch, then fight your way to the Legate's Camp. If you pass a Barter or Speech 100 challenge, you can convince Lanius to withdraw without engaging in combat, otherwise you'll have to fight him. On your way back across the dam, General Oliver will show up. Again, if you can pass a Barter or Speech 100 challenge, you can convince him to retreat, otherwise you'll have to wipe out Oliver and a squad of NCR Veteran Rangers.
Your task is to kill Legionnaires left and right.
At the end of the mission there will be a difficult Legionnaire boss. I advise you to wear a suit with +5 speech and read the magazines if you don’t have 100 speech, because I killed him for a long time (I really liked his mask), then I killed him and decided to come to an agreement with him.
After completing the mission, watch the inserts, and, yes, the trophy is yours