TimeShift

Boosting partner required.

You will need to win a RANKED match on all 5 maps that come in the DLC1 pack

Gametype does not matter.

Here is the list:

Red Laser District (DLC1)
Dust My Broom (DLC2)
Smokestack Lightning (DLC3)
Jump, Jive, an' Wail (DLC4)
Beware, Brother, Beware! (DLC5)

Here's a list of the maps you need to beat to unlock this achievement;

• Beware, Brother, Beware!
• Dust My Boom
• Jump, Jive an' Wail
• Red Laser District
• Smokestack Lightning

As stated in the description you need to be playing ranked games for any wins to count toward the achievement, however you are able to play 2 player ranked matches which makes boosting very easy.

All the maps are quite small and you shouldn't get lost looking round them, just try and meet up in the middle, to help speed up the process have the host player create the match with a 1 kill limit, each game should take around 30-40 seconds!

This is quite an easy achievement to earn. The DLC for TimeShift is free, so download both DLC 1 and DLC 2, and then with a boosting buddy, set up ranked matches on each of the new maps, taking turns winning them.

See this article for more information:
http://www.360-hq.com/article-2630-thread-1-0.html

Has to be in a ranked match and can be easily boosted, the 5 maps are:

Red Laser District (DLC1)
Dust My Broom (DLC2)
Smokestack Lightning (DLC3)
Jump, Jive, an' Wail (DLC4)
Beware, Brother, Beware! (DLC5)

Create a ranked match and set it to 1 kill. After you have readied up it's possible for one player to quit and the other will be credited with the win. Much easier than traversing the maps to find eachother.

Also note that Dust my Broom (DLC2) won't be available if you are playing the one-on-one gametype, just switch it to another genre