Fallout: New Vegas
75 Achievements
112-136h
For the Republic
Complete For the Republic.
11.3%
How to unlock the For the Republic achievement in Fallout: New Vegas - Definitive Guide
Note that towards the end of this storyline, you will also have the opportunity to complete the "You'll know it when you see it" achievement as well.
This storyline completes with "Eureka!"
After completing the first two NCR quests, (Things That Go Boom and Kings' Gambit), head to Hoover Dam and talk to Colonel Moore.
You will now have to deal with the Great Khans, the Omertas, Mr. House and the Brotherhood of Steel. Your last objective will be to protect President Kimball.
Since this is Fallout, there is more than one way to skin a cat. So I recommend to use this very helpful and detailed walkthrough:
http://fallout.wikia.com/wiki/For_the_Republic,_Part_2
This achievement is unlocked after you complete "For the Republic Part 2." To start this quest line, you will receive a message from the NCR ambassador on the Strip via courier. Accept his invitation and then simply start doing the quests he gives. His mission is split into two parts, so check out this walkthrough for the second part of For the Republic.
Main quest mission leading up to the NCR ending in "Eureka!". Note that progress in another ending will cause this mission to fail with the message "Don't Tread on the Bear!", making this ending unavailable.
This is a long mission with a number of discrete steps:
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After "Ring-a-Ding Ding!" you'll be approached by a messenger directing you to the NCR Ambassador.
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Complete mission "Things That Go Boom". If you've completed "Volare!" this will be easy.
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Complete mission "King's Gambit". This is easiest by talking to The King, conveying his refusal to Crocker who through conversation will direct you to Col Hsu at Camp McCarran. Pledge to The King more NCR resources to Freeside, and The Kings will join you. After you kill Pacer, that is. Return to Crocker to start "For the Republic, Part 2"
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Col Moore at Hoover Dam directs you to recruit or eliminate the Khans. If you've completed the mission "Oh My Papa" this is easy.
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Col Moore then directs you to recruit or eliminate the Omertas. If you've completed the mission "How Little We Know" this is easy.
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Col Moore's next target is Mr. House. Kill or disable him.
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Lastly, you'll have to recruit or terminate the Brotherhood of Steel. If you've already completed "Still in the Dark", this is easy.
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Complete "You'll Know It When It Happens"
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Return to Col Moore to complete the mission.
This will launch the mission "Eureka!" and give you the trophy.