RISK

You need to actually eliminate the other player. So winning a game of Capitals real quick wont count towards this.
Best thing to do is play a 5 player local human game. Making sure you just steam roll everyone and have the other 4 keep attacking each other in order to keep their armies at one per country. 13 games or later the achievement will be yours.

This Save exploit was originally described by iceape911 for the 360 version of the game. I have added additional information for clarification.

No Mercy – Eliminate 50 Players | 50 GS | Est. Time 0.5 Hour

This achievement requires one “setup” round then exploits the auto save feature to finish off these players eliminates in the most efficient way possible.

The Setup Round Settings
Objective: World Domination
Territory Allocation: Manual
Fortify Rules: Contiguous
Ceasefire Card: Off

In the player setup window move all AI Players to Human Player so that you control every player. Now start the game. Since we used manual territory allocation we get to select all of the territories on the map for every player.

Turn 1

The fastest method to place the “non-main account” players armies is the press a until your turn. This will default to the non-main account players dividing up the North America, Europe, Asia and Africa Continents. For your main account territories I would suggest getting the Australia Continent (Indonesia, Papua New Guinea, Western Australia and Eastern Australia) and the South America Continent (Columbia, Peru, Brazil and Argentina). This will net you 4 additional armies at the beginning of your first turn.

After all of the territories belong to players you must now place 3 additional armies per territory for all players. You can place all of the “non-main account” armies in the same territory or spread them out it really doesn’t matter since you will be getting additional armies due to the continent bonuses you will be receiving. Place all of your main account armies in Brazil.

Once you have finished the territory allocation the game begins. I would recommend weakening the “non-main account” players in Asia as this will help you take the Asia Continent on your second turn. Once your turn begins you should easily be able to take Africa and almost half of Asia. I recommend following this attack pattern: North Africa, Congo, South Africa, Madagascar, East Africa, Egypt, Middles East, India, Siam, China and Mongolia. Depending on your dice rolls you should be out of armies at this point. Now quickly press through all of the “non-main account” players until you get to your main account again.

Turn 2

During this attacking phase place all of your armies on Mongolia and follow the following attacking pattern: Japan, Kamchatka, Irkutsk, Yakustk, Siberia, Ural, Kazakhstan, Ukraine, Southern Europe, Western Europe, Northern Europe, Britain, Scandinavia, Iceland and Greenland. Depending on your dice rolls you should be out of armies at this point. Now quickly press through all of the “non-main account” players until you get to your main account again.

Turn 3

During this attacking phase place all of your armies on Iceland. During this attacking phase you want to reduce all “non-main account” players down to one territory each and then end your attacking phase. Now quickly press through all of the “non-main account” players until you get to your main account again. Begin your attacking phase and eliminate only 3 of the 4 “non-main account” players. After you eliminate the 3rd go to the main menu and quit. The following message will appear “Are you sure you want to quit the game? All unsaved progress will be lost.” Press to quit.

Now in the Main Menu select Play Game and you will get the following message “An auto-saved game is available, would you like to continue it? Press to continue. This will load the game at the beginning of your final attacking phase.

Now simply just repeat Turn 3.

--- Happy Hunting ---