Once your vilified is there any way to better your rep? I'm vilified by Caesar's Legion and I'd rather not have to complete "The House Always Wins" mission going in guns blazing. If i kill Caesar (which isn't what your supposed to do so it's not a spoiler) i will miss out on 3 achievement quests, any advice would be greatly appreciated

The only way I can think of is if you disguise yourself as one of Caesar's Legion. However, if you do and you gain rep, then you will only gain rep based on the fact you are wearing that outfit. What I mean is that your disguised self will gain the rep, but not your main self. So you will have to go in disguised every time.

I tried putting on the Caesar's armor, (doing the same mission and same rep), and they let me walk around for a bit and all of sudden turned on me. I plan on just coming back more prepared and taking them all on, sense I almost was able to with little gear that I had. 

But i figured if you kill Caesar you can't get anymore quests from him. Am i going to have to restart the game and be careful with each faction or do you think they will patch this reputation issue?

Im in the exact same condition. I have to get the chip from the fort AND Im vilified by the ceasers. Every time i go in guns blazing i get killed, soooo now im stuck. I dont know what to do. damn 
 
Anyone have any advice? i even tried stealthing in, but you cant steal from ceaser and every time i open fire i die

I understand its not a bug but they give no precursor to not being able to revert back to good faith with a faction. To completely fuck up your game 11 hours in and missing out on 4 Caesar's Legion quests is in my opinion bullshit

The thing with being vilified by someone is that you can wear their armor as a disguise, but guards, named NPCs and guard dogs will see through the armor when you get close.

So basically there's no way to get into Caesar's tent unnoticed, and there's no way to better reputation once your vilified

I was villified with him but he sent a messenger and pardoned me when his quests came up.

sneaky sniper.  

that's the solution to almost every combat situation in the game, I've found. 

get a silencer for the sniper rifle, or a modded cowboy repeater works great because you don't have to reload as much, and let them run at you while you pick them off.

once you get into the tent, if you have the wild wasteland, it would be a great time for the holy hand grenades or just mini nuke them if you're having that much trouble.  

Is this before or after you guys got the Mark of Caesar?  If its after, what did you do to Villify yourself down from Netural that quickly?

" I tried putting on the Caesar's armor, (doing the same mission and same rep), and they let me walk around for a bit and all of sudden turned on me. I plan on just coming back more prepared and taking them all on, sense I almost was able to with little gear that I had.  "

You get the mark when you walk out of Lucky Casino correct?

I currently just reloaded an earlier game when I'm neutral with NCR and i still get shot on site by them, that is what i don't understand

I really didn't have that much trouble killing them all, even without boone or any other companion. 
I snuck into the base, with legion armor donned. Avoid dogs, characters named "guard" or characters with actual names. 
From here I used a silenced sniper to clear out the grounds when I was hidden (quicksaving when necessary). Then I used a stealthboy to get into caesar's tent and sniped his head right off. Had a long battle against his minions after that which mostly involved a lot of backing up while I shot them in the head. 
Bring Stimpaks. 
 
I don't think there is a way to get out of the villified situation in the case of the Legion.

Well i started over, honestly my advice for everyone is DO NOT under any circumstances kill any of the main factions (NCR, Caesar's Legion) prior to Vegas it can ruin the rest of the game after, even after being redeemed with both factions making it to vegas it still glitched out and i was constantly attacked by NCR while being "neutral"

Not to beat the proverbial dead horse, but I would recommend sneaking into Caesar's tent (using a Stealth Boy) and having a chat with him. Barring that, just ignore the achievement business and play the game. There will be plenty of time to get your achievements in subsequent playthroughs.

" Not to beat the proverbial dead horse, but I would recommend sneaking into Caesar's tent (using a Stealth Boy) and having a chat with him. Barring that, just ignore the achievement business and play the game. There will be plenty of time to get your achievements in subsequent playthroughs. "