TimeShift

You will need a boosting partner for this.

There are 14 total maps, you must win a RANKED match on each of them. Certain game-types only allow certain maps. 1v1 is the best as you can play all maps on that gametype.

DLC maps are not included in this achievement.

Here is the list:

Rooftop Excess (MP1)
Corrupt Data (MP2)
War Room (MP3)
TimeShaft (MP4)
Sanctorum (MP5)
Trench Warfare (MP6)
Deadly Wind (MP7)
Tower of Power (MP8)
Supply Dump (MP9)
Frost Bites (MP10)
Abandoned Warehouse (MP11)
Uncivil Engineering (MP12)
Blow Me (MP13)
Sky Hook (MP14)

For this achievement you need to win on each of the 14 maps that were shipped with the disc, they also need to be in ranked games, due to the online feature of this game being all but dead you may need to find a boosting partner, you can create a gaming session here; http://bit.ly/gTa5Tf, you'll need a total of 2 players to boost this game.

Assuming you've decided to boost this, once you're ready to do so decide amongst you who is going to be creating the matches, it's that persons job to make sure they cycle through the maps, how you decide to alternate is your choice.

To speed up the boosting process you can opt to play Deathmatch and set the score limit to 1, this way you only need to kill your opponent once and the game will be over, when you're both in the game make sure to press start and ready up.

Here's a list of each of the maps, use it to keep track of which maps you've won on;
• Rooftop Excess
• Corrupt Data
• War Room
• TimeShaft
• Sanctorum
• Trench Warfare
• Deadly Wind
• Tower Of Power
• Supply Dump
• Frost Bites
• Abandoned Warehouse
• Uncivil Engineering
• Blow Me
• Sky Hook

Each of the maps is also tagged with it's map number which makes cycling through them that much easier, for example "Rooftop Excess" which is the first map is tagged (MP1), the above list is listen in numeric order.

This achievement is very easy but is a lil weird on how and when it will pop. I first went down the list of maps changing game types to do the game type achievements along with the wins. But when I was finished with all 14 maps, the cheevo never popped.

So if that happens to you, just stick with 1v1 all the way through. Even maps you know you've won, mp1-mp14 all in 1v1. 1 kill limit should do that trick. Also, don't exit the game right away, press X to exit the game when it shows you "Press X to exit the game." Sure that isn't mandatory to do, but it worked for me. Once you finish mp14, pop.