Fallout 4

Fallout 4

84 Achievements

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108-139h

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Ad Victoriam

Ad Victoriam

Complete "Ad Victoriam"

30

6.16%

How to unlock the Ad Victoriam achievement in Fallout 4 - Definitive Guide

To get this achievement, you'll need to side with the Brotherhood of Steel and complete all their quests.

When you do The Molecular Level quest, you'll want to take schematics to the Brotherhood. Build the Signal Interceptor and Elder Maxson will give you a mission to get Doctor Li to join the Brotherhood again, do this quest (if you fail to recruit Doctor Li you will end up getting a different quest, recruiting Doctor Scara thanks to Wyyvern) and complete Institutionalized. You'll go back to Commonwealth to Elder Maxson, he'll give you the quest Liberty Reprimed. After this quest he'll give you Blind Betrayal, complete this to get the quest Tactical Thinking. (You'll get to kill the Railroad)

Once you get rid of the Railroad return to the Brotherhood and you'll receive Spoils of War this is the point of the game where the Institute will become hostile. Once you complete this quest you'll start the final mission called Ad Victoriam.

If you're going to vote negatively, tell me why.
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14 Comments
It seems 2 ppl want you to get the chievo for themroll, good enough for me
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By oO Twanger Oo on 03 Dec 2015 17:53
I'm thinking that as well lol. laugh
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By on 03 Dec 2015 17:56
Do I have to complete every cleansing the common wealth quests in order to get this achievement?
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By Leon Kennedy226 on 06 Dec 2015 08:13
No those are infinite. Those are not main quests.
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By on 06 Dec 2015 16:52
Then what quests do I need to complete for the brotherhood?
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By Leon Kennedy226 on 06 Dec 2015 23:57
Have you looked at the solution on joining the brotherhood.
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By on 07 Dec 2015 00:04
Then what quests do I need to complete for the brotherhood?
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By Leon Kennedy226 on 07 Dec 2015 02:14
I listed them in the solution....
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By on 07 Dec 2015 02:26
Then what quests do I need to complete for the brotherhood?
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By Leon Kennedy226 on 07 Dec 2015 19:13
Elder Maxson will give you a mission to get Doctor Li to join the Brotherhood again, do this quest and complete Institutionalized

Do I have to get Li back? On my playthrough, I rejected to join the Institute (making it so I had to leave immediately) but I still completed Institutionalized. I don't have any save files from before I did this, so...
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By Wyyvern on 09 Dec 2015 10:50
I actually do not know, I assume you do because she has to do with the later quests. Try to continue with the brotherhood and let me know please.
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By on 09 Dec 2015 17:41
Sorry I took a while, but I can confirm you don't need to side with The Institute and get Li back to get to this quest and achievement. Maxson gets mad at you for about 20 seconds then gives you Liberty Reprimed anyway. You're tasked to recruit a "Professor Scara" who I assume takes Li's place.
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By Wyyvern on 13 Dec 2015 22:07
Pretty sure people who vote negatively is because you don't have the achievement
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By on 28 Dec 2018 14:12
done quest no achievement how is Bethesda this dogshit
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By Horizon Thor on 17 May 2024 17:20
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This is the last achievement in the Brotherhood questline (excluding The Nuclear Option, which can also be achieved siding with the Minutemen or the Railroad).

While the solution by HardcoreBabyGrl shows perfectly how to get this achievement, I wanted to share a chart I made with the way of getting all the story achievements with only one save / reload, and also the best point to save in order to obtain all 4 endings (not necessary for achievements).

Scroll down for a more detailed explanation (inside the Spoiler Tag, as it is an awful lot of text).

External image

For starters, keep in mind a thing: having high charisma will help you when you'll have to balance several factions at once. I recommend having at least 6-7 points of charisma, and using "charisma-enhancer" gear like Glasses, Hats or Suits, or even using, when neccessary, beer or some drugs as Grape Mentats or Day Tripper that give charisma points for a few minutes.

Open this thing for the full explanation:


Hope it helps!
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07 Dec 2015 20:31

13 Comments
This is perfect. The other ones are so confusing! 15 thumbs up!
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By Jedi Pirate Oni on 07 Dec 2015 22:38
Top guide! The only thing which confuses me that Blind Betrayal apparantly locks the Railroad, as I completed Blind Betrayal, went back to the Railroad and after handing over the tape it immediatly started Underground Undercover.

What am I missing? Build the device with the Minutemen, gave the tape 1st to the Brotherhood. Asked the tape back and then gave it to the Railroad.
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By Parallax Demon on 10 Dec 2015 20:47
Maybe it was a glitch or something in my game, but as soon as I completed Blind Betrayal, the next Brotherhood quest, Tactical Thinking, started automatically. I went to the Railroad and I couldn't interact with anyone, they only made comments, no dialog options or anything. I assumed it was because of the nature of the Brotherhood mission, but maybe it was a glitch.
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By amenazamenor JF on 10 Dec 2015 20:58
Have Tactical Thinking active. The only thing I can think of is how you resolved Blind Betrayal.

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By Parallax Demon on 10 Dec 2015 22:15
I resolved it that way too. I don't know, I'll try to play it again if I have a nearby save to see what happens, and I'll update the guide.
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By amenazamenor JF on 10 Dec 2015 23:16
Fantastic guide dude, have a smiley face smile
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By ClawColyer on 19 Dec 2015 00:25
Perfect solution!
Thumbs up from me. 👍
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By CadetChik on 07 Jan 2016 11:06
@ClayTheGreat, you don't have to warn father about any ambush. What I meant is that, when father asked you why the synths were freed, you should tell them you were ambushed.

Anyways, the way you did it, you still can follow the guide, but the next time you talk to the Railroad, you'll have some explaining to do. Make a save before talking to them in case you pick the wrong dialog option and make them hostile. You'll have to try to convince them that it wasn't your fault. After that, you'll be good to go.
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By amenazamenor JF on 29 May 2016 20:20
Ok, thanks man! Appreciate the quick reply!
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By ClaytThaGreat on 29 May 2016 23:46
perfect thank you!!!!
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By SyrupSeason on 07 May 2017 04:24
Just remember to do all of the Nuka World line before finishing When Freedom Calls if you want to keep Preston as a companion.
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By Rafe Harwood on 07 Nov 2017 02:58
It's not a big deal as Blind Betrayal can be done within 10 minutes. I got a bit uneasy when I read you can't do it before making your first hard save.

Really appreciate your spreadsheet and will continue the missions in the right order smile
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By Parallax Demon on 10 Dec 2015 23:56
I have a question about "The Battle of Bunker Hill"... I warned the railroad, but I was confused by 'side with them' (a bit vague), and I dealt with the escaped synths by pressing A and resetting them to their factory settings (maybe that's what I did wrong?). When a I went to meet Father at the top of the ruins, there was no prompt to warn him about the ambush... Help, please! Don't want to screw up this playthrough...
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By ClaytThaGreat on 29 May 2016 16:50
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MISSABLE!

Quest Giver: Elder Maxson
Location: The Prydwen

This is the second to last main mission in the Brotherhood of Steel line. The first quarter of the mission are filled with following and placing items, but the majority of the missions deals with Liberty Prime and following it. Liberty Prime is an absolute juggernaut so there is no need to be out in front of it during the mission, simply follow behind and help kill enemies. Be care though, Prime drops lots of nukes so do not get too close to enemies he is engaging.

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MISSABLE! - Completing the quest for the Institute called "Mass Fusion", will make the Brotherhood of Steel hostile and prevent you from completing their quests for good. Completing the quest for The Railroad called "Precipice of War" will also make the Brotherhood hostile! The game tells you this though before you do those actions.

Faction: Brotherhood of Steel
Quest Giver: Proctor Ingram
Location: The Prydwen

First of all, you need to activate Liberty Prime. You do this by plugging the Beryllium Agitator into him then just follow Liberty Prime through the streets of Boston. He will kill everything for you so you just need to follow him until you reach the C.I.T. Ruins, where he will blow a hole in the ground which will lead you to the Institute itself. Be careful of Liberty Prime though, because the Nukes he throws will kill you if too close to the explosion.

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I encountered an unpleasant bug that prevented me from getting this trophy.
When you get to the subway, I strongly advise you NOT to take Deacon as your partner when he offers you.
Having encountered this problem, I had to roll back my saves by 5-7 hours, so better be on the safe side.
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08 Nov 2022 08:44