Fallout: New Vegas
75 Achievements
112-136h
The House Always Wins
Complete The House Always Wins.
10.8%
How to unlock the The House Always Wins achievement in Fallout: New Vegas - Definitive Guide
After you complete the quest Ring-a-Ding-Ding given by Mr.House (Also a achievement gained for this) he will give you the set of missions that will unlock the achievement these are;
1.The House Always Wins, I
2.The House Always Wins, II
3.The House Always Wins, III
4.The House Always Wins, IV
5.The House Always Wins, V
6.The House Always Wins, VI
7.The House Always Wins, VII
You will unlock the achievement when you complete the final quest for Mr.House and agree to go to Hoover Dam.
If you having trouble with these quests go to this link http://fallout.wikia.com/wiki/The_House_Always_Wins .
All credit goes to Fallout Wikia for the detailed walk through.
This achievement is unlocked after you complete "The House Always Wins, VII." When you first meet Mr. House, agree to help him. Then complete the six parts (two are mutually exclusive) of this massive quest and you'll gain the achievement. See here for a detailed walk through.
Main quest mission leading up to the Mr. House ending in "All or Nothing". Note that progress in another ending will cause this mission to fail with the message "The House Has Gone Bust!", making this ending unavailable.
This mission set is actually made up of seven numbered missions for Mr. House to secure his dominance.
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Bring Mr. House the Platinum Chip and watch his Securitron demonstration. If you didn't recover the chip when you confronted Benny, you'll have to recover it during part 2.
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Take the chip to The Fort and upgrade the Securitrons in the Bunker.
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Secure the help of the Boomers. If you've already completed "Volare!" this will be easy. If you want to save time, or they don't like you, Mr. House will also accept eliminating them as a threat.
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Look into the Omertas. If you've already completed "How Little We Know" as described in the Road Map, this mission will be completed automatically.
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Mr. House will accept nothing less than total destruction of the Brotherhood of Steel. Use the keycards from McNamara, Hardin, and Taggart at the terminal in the VR chamber to generate a self destruct password for the red terminal. Then flee the base.
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If you have a Reputation of Accepted or better with the NCR, this mission is the "You'll Know It When You See It" mission. If not, you'll skip immediately to...
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Install an override chip at the El Dorado Substation.
Once all seven quests are complete, Mr. House will ask if you're ready for the final battle, which will complete this mission, give you the trophy, and trigger "All or Nothing".