Brütal Legend

To aquire this achievement you need to spend 250 000 fans, after beating the campaign you'll probably have around 60k spend, so try to make 50 wins now. When i won last 50 match i had 156k... So i went boosting them :D Here is my way how i did this: Start a custom match WITHOUT AI on a map called "feeding area" ( yes! you can do that ;D) there will be an enemy base but it will make nothing. There's an monster on the middle of the map, fly there and play a solo to make your rally point here. Capture every leecher on the map so you'll cash will raise faster
( there's 4 you can capture in this map ) and then just upgrade your stage to maximum, your headbangers, chicks and healing bike also, then start producing units, headbangers are best because they die from 1 hit of this monster in the middle ;]. So just sit and do it for few hours and you'll get it!. Cheers! ( And sorry for my poor english hehe) * as many ppls said this work only when you are ONLINE *

######### Please note: #########
This solution is the fastest method for players without the 'Hammers of Infinite Fate' DLC.
If you have the DLC just take a look at the solution below, written by DanTheManGum.


Start a custom match without any enemy and set the map also to 'Feeding Area'. Instead of choosing 'Ironheade' switch to 'Tainted Coil' and start the match.

First thing you've to do is, of course, capture every fan geysir. Meanwhile place the rallye flag right in front of the giant worm in the center of the map. All you have to do now is building a lot of 'Battle Nun's. Why 'Tainted Coil' and why 'Battle Nun's you ask? The math:

Headbanger (Ironheade)
Costs: 100 fans / load: 4 units / building time: ~10 seconds

Battle Nun
Costs: 75 fans / load: 1 unit / building time: ~5 seconds

Due to the small load of the battle nuns you can build 40 nuns at once. That are 4500 fans spent in about 5 minutes ... instead of 30 headbangers and 3000 fans while playing as Ironheade (in 5 minutes+ because of the capacity limit).

The nuns will die just as fast as the headbangers. One hit by the worm and they're dead.


######### Update #########
Since a few commenters are quite doubtful about the math, let's dig deeper into the rabbit hole.

If you get a constant stream of fans without any interruption you'll need ~9 hours just to get 250.000 units from the geysers. That are ~22 minutes for full 9999 fans. Since you can't get more than 9999 fans at once, you need to spend them ASAP to receive more fans. ( The interruption I mentioned. )

So, ...

If you want to build Headbangers you need ~17 minutes to spend the whole 9999 fans. But that's w/o the capacity limit. If you take the cap limit and the time needed for killing the Headbangers into consideration you'll easily exceed the 22 minutes. Therefore this odyssey will take longer than just 9 hours in total!

If you want to use Nuns instead, you'll only need ~12 minutes to spend the 9999 fans. Let's say 13 minutes, due to the killing - just to be fair. There's no way you hit the cap limit. You'll get a nice constant stream of Nuns. So, it takes you ~5 hours to build enough Nuns worth a total of 250.000 fans, while leaving you with about 4 hours for whatever you want while acquiring fans for the next batch.

This achievement will take you at least 9 hours - w/o the DLC. No matter what.

IF you choose to build Headbangers it takes longer than ~9 hours.
IF you choose to build Nuns it will definitely take ~9 hours in total.

NO, there is no faster method (w/o the DLC).
NO, not even with a turbo controller.

You must have the hammer of infinite fate dlc as well as being connected to live (you do not need another player).

Pick a custom match with no opponent.
Pick the Tainted coil as your army.
Pick Crucible of the Titans as your map.
Build 4 battle nuns at the beginning of the game and take over all fan geysers (there are 4 with leeches 1 enemy controlled and 1 you already control).
Now set your rally flag to the left of your starting stage on the bridge (not the one straight ahead). Continually build nuns.

This method is slightly faster than the feeding area due to the extra fan geyser. You must pay sleight attention in case the Titan stops hitting your bridge but this only happened once to me in farming 150,000 fans. I also lets my fans build to 8k to see if I could whittle it back down and indeed you can easily.

Good luck all.

I found this to be way easier. Credit to BigTrue23 on xa360.

This is the fastest way I can figure to get the Sellout achievement for those who didn't spend many fans in the single player game. This strategy requires the Hammer of Fate DLC.

1. Load up a custom match on the map 'Altar of Blood' with Ironheade

2. First off, create 3 groups of Razor Girls and use them to take the other four fan geysers on the map (2 in the middle/2 near the opposite stage)

3. While you are taking the fan geysers, use the incoming fans to upgrade your stage the whole way and upgrade your units (quick use of 200 fans) Also make sure to set your rally flag in the middle of the map (between the two fan geysers)

4. Once you have all the geysers, and your stage is fully upgraded create a rock crusher, and use your remaining unit limit to create bouncers.

5. Once all 40/40 have been used and all your units are in the middle of the map, fly up through the skull mouth on the left of the map and use the X + A move to drop the motor and release the blood in the middle of the map. This will kill all of your units and allow you to continually create more.

6. As soon as you rock crusher is destroyed, create another one and follow up with 17 bouncers. This combo with allow you to use 2,150 fans prior to releasing the blood. Rinse and repeat.

Now, I was able to complete every build/blood release round in about 3 minutes. Allowing for some error here and there, lets call it 2,150 fans every 5 minutes. The math comes out to 32,250 fans every hour. This means you should hit the cheevo in just under 8 hours (if you started from zero total fans).