Command & Conquer: Red Alert 3

Worked first time. Nice one :)

This guide is shit i ended up doing all the work took me 6 mins

This didn't work for me. Switching sides like Alexiel Soli 69 said didn't work for me either. I had Oleg (soviets) as a ally and Lisette (allies) as enemy. That did it for me.

I guess that you just got to be lucky, because i also had the problem that the enemy would pack up they're construction yard and flee. That costs time.

Tried 3 times and the medium AI has mopped the floor with the brutal AI

Took about 5 tries to win, and several more tries to get it under 5 minutes..

Dont forget to instruct your ally to attack the MCV directly when the game starts or it will focus on its own base first == lost time.

This one didn't work for me. After 4 or 5 tries, i gave up and went with the x360a guide, worked first try, if you have trouble, try this:
http://www.xbox360achievements.org/game/comman-and-conquer-r...

To all the people who are bitching about this guide;

You have to place yourself on the main part of the fortress and your Brutal Rising Sun Ally with the Medium Allied AI at the bottom.

It is preferable if the Allies AI is Giles as he will just make a few air bases.

Can confirm that LanEvolX's suggestion (the x360a guide) worked on the first try. Won't vote on this solution either way, as I didn't really give it a try.

Worked perfectly, thanks.

A sure fire way to get this achievement is to have a brutal giles on your team vs a medium naomi and order him to attack all the mcvs with his aircraft with the hidden fortress method

Doesn't work. Seems there's a bug or something. Your medium enemy attack like a brutal enemy and your brutal ally attack like a medium ally. Heck, I even played 3vs1 but can't get it to win under 5 minutes.

OK, what I done is, put both enemy and ally on medium (doesn't matter since the AI diff. was broken), both you and ally as Allies, enemy as Rising Sun. After game start, just ask your ally to attack the MCV, while you create 4 airfields. Once all airfields filled up just attack. For some weird reason, after the match, when I go to summary, it states that I finished the game in 05:09...and I still got the achievement.

Worked very quickly! Thx

Welcome! :) Sorry to those it didnt work for.. they could have fixed it by now.

worked for me, just...4:57 lol

Your brutal teammate practically starts in the medium opponent's base. It was all over before my units could even get all the way across the map. You don't need to do anything, but if you want to build a few units to make yourself feel better, then go ahead.

Works fine, id only add that you should build 2-3 do-jus and spam the drone unit, have them all sit top left of the map and wait for the fleeing MVC. When it does show up just self destruct on the MVC.

This was truly awesome. I put turrets in my allies base to help speed things up.

I had some difficulty with this one and it took several attempts. Firstly, I sat idle but the enemy base flees and I did not get there in time to blow it up, many times after I try to help by building up resources and attacking forces at the spot where they flee but this somehow caused my partner confusion and on two attempts they fleed to sit next to me. On the final and successful attempt I basically sat back and watched as the AI partner quickly destroyed the base then I simply used the LB trigger and right on d-pad then select MCV, this gives an attacking order and the AI will quickly pursue. The game finished in less than 4 minutes total and I got the achievement.

used the same tactic as Kennyannydenny and it worked.

Worked just fine for me, used the settings from the solution, and just directed my AI to target the MCV. Under 4m first try.

I know this is an old game but... If anyone else is struggling with this, make sure to put yourself in the north so your allies and enemies start out next to each other. Then the enemy will pack up their MCV and move it to a sliver of a section of the map on the western edge. I just made sure to instruct my ally to attack the MCV there for the win.
I had to do it 3 times cause when it drives over there I told them to attack, then when it unpacked I had to tell them to attack again, then it packed up again so I instructed them to attack a third time to win. For some reason when the game switches from unpacking to packing up they don't continue to attack.
Weird. Anyway this still works if you do it this way.

Did this solution and worked 1st time I wish I could give it more thumbs up.