F.E.A.R. Files

There are 2 sets of maps. The quickest way to do them is clear the Conquer All maps. If you are boosting then this will also get you another achievement: Conquering Hero (15G - Conquer 25 control points in ranked Conquer All matches)

Then clear the other set of maps. This can be done in any match type except Conquer All. The fastest way to clear these is Elimination matches. You can also combine completing these maps with another achievement through boosting if you do these maps Control matches to achieve Control Freak (15G - Capture 25 control points in ranked Control matches)

The Conquer All maps are:

Clone
Dead wood
Depot
Facility
Heliport
Labs
Rubble
Spill kill

The other match type maps are:

Bedlam
Cafeteria
Campus
Construction
Docks
Forgotten factory
High tech
Hotel
Museum
Office
Train yard
Stockpile

Thanks goes to Omegalite and AtlasRapture86 for their help

If you are in a hurry, start with the Elimination maps. You get a win and the match will be over very quickly. Next you'll have to do the Conquer/Control maps.