Grand Theft Auto IV

To extend on Mr Mus2nd's solution - those with TBoGT DLC can get this done in, literally 20-30 minutes.

What you need to do is complete the mission entitled "Momma". Very early in the DLC, where the debt collector is hassling Luis' mother.

You will follow said debt collector out of the house and around the corner, down an alley and into a room where the LC fights take place.

You will be forced to fight three opponents in order to earn money for the debt collector - as he will bet on you winning the first two fights, and losing on purpose in the third.

Complete the mission - it'll take 5 minutes. Then head back around to your safehouse and save your game (just to be sure)

Once you are done the LC Fight venue is unlocked for you to visit whenever you want. Go in and pay $50 to spectate.

Now, every time a fight is about to start, you'll be asked to bet on one of the fighters. This is where the easy money comes into play.

Look at the fighters. Is one of them tough looking, doing a mean impression of Tyler Durden (Brad Pitt style) from Fight Club? Is the other fighter a bit, well, doughy around the middle? Is he dressed in a suit? Does he look like he could do with a good feed?

If so, bet on Mr Durden. And when I say bet, I mean bet everything you have. Watch the figures scroll upwards as you increase your bet.

Then, lay your bet, sit back, grab some popcorn and watch the cage fight. If you've successfully predicted which of the fighters will win, you will be treated to a fistful of dollars (apols to Sergio Leone there) entering your pocket.

From there you can do one of two things - dash out, go back to your safe house and save your game (with extra money), or you can bet again on the next fight.

I personally always like to have a look at the fighters in the next fight. If it looks like an easy one to pick a winner in - one guy looking mean and nasty, the other looking like a bit of a weakling - then by all means bet everything again. If you are unsure, just bet $100 - you can afford it!

Continue to bet on winners, save, bet, save and bet again. Eventually you'll be raking in the dough and, after about 6-7 bets, will easily notch up your half million dollars.

Exit the club, save again, and spend your new found wealth on some nice threads for Luis, some lovely weapons - more of those sticky bombs please - or whatever you want.

20-30 minutes to get 55 GS and 80 TA points - not bad at all.

Just end the main storyline, you will have lot over 500,000 $.

If you want to earn quick money, do jobs for Stevie. About 300,000 $ for all cars.

Simply follow the instructions, dont spend on worthless things. You should get this easily just by playing through the game, there are two missions that net you $250,000 each so you can get it just from them. Also if your low on cash at the end,take the deal it will earn you an extra $250,000.

You'll probably get this achievement somewhere between when you're 3/4 done the story missions to when you're done all the story missions. If you got Stevie's text message already and you haven't gotten this achievement yet, do some car deliveries as they give you around $10,000/car.

Okay like TD Apocalypse has said there are two Mission in the Storyline that get you $250,000 each, Three Leaf Clover, (the bank robbery mission) and The 1st mission in the Deal ending. If you have already finished the main Storyline and have done Revenge then you will not be able to get the Achievement unless you start again. TIP: If you don't have the Liberty City Minute Achievement then i suggest trying both of these Achievements in the one go.

an easy way: play dlc-gay tony bet money in the fight club and you will get tohalf million in 20 minutes

If you have delivered all of Stevie's cars he will give you money for ANY car you deliver (not taxis or cop cars or trucks). A SuperGT is $11,000, so get a few of those in perfect condition; or if you use cheats (please don't) use the cheat, drive in, repeat. You can get like $100,000 in like 2 mins.

Look, you won't have to do just about anything for this achievement. Simply do the story. That's it, you'll have this achivement by around half-way well at least I did.

what i done is complete all of stevies car orders and then stood outside spawning turismos and supergts i earned about 300 thou from the actual car orders and just topped it up 2 500thou

For those of you that have The Ballad of Gay Tony, I found the fastest way to get a half of a mill. All you do is go to the arena, save first, and bet all your money on the person that you'll think will win. Your money doubles each time. If your fighter loses, then reload save and go bet again. If your fighter does win, then go back and save again. This should take about and hour or so. Remember, this only works for the people who own TBoGT.

The above solution is good if you're starting afresh and are planning to get this achievement along the way. If you're like me, however, you frivolously spent money throughout the story for one reason or another and found yourself at the end of the game trying to clean up achievements and being short of the necessary monetary requirements.

I have a simple solution that helped me get it in a matter of a day or so.

Go to the South Bohan safehouse. If you look on the map just a couple blocks over is a marker for a garage.

Go to the garage and begin stealing cars nearby and taking them into the garage. You will receive money for this. The highest I can recall getting for one car was $7,000. The lowest was $0, but I think that is a result of taking the same type of car in too many times--I'm not sure on that, however.

Keep an eye out for cops, obviously don't steal a car while they're around.

Invariably the cops will be called and converge on your location. If you're daring you can still sell a few cars before they're really a big enough nuisance that you need to leave.

When you feel the need to leave go can quickly walk two blocks over to the safehouse, go upstairs and save. When Niko wakes up from his little nap the cops have apparently decided you were just extremely tired and the multiple instances of grand theft auto were justified (i.e. they're not after you any more).

Go back to the garage and continue. It may take a while, but it is a quick and relatively safe way to achieve this.

The fastes way to get 500k$ in less than 1h is go on Grotti Showroom on Middle Park East, take a car (Turismo) and go sell to Stevie's garage, every Turismo give u 30k$, in this way u get money very quick and easy too if u already finished the game to 100%