Syndicate

For this achievement, you need to play through 9 maps in "coop" which can be done by yourself or with a group/syndicate of 2-4 people. The coop is basically a 2nd campaign that you get to play with your buddies and allows you to upgrade a variety of weapons and skills that you did not get to fully experiment with during the SP campaign. The coop maps can be played in any order, but if you follow the linear direction that the game suggests, you will tackle them in this order:

Western Europe > Mozambique > Atlantic Accelerator > Coloroda > China > Scandinavia > Northern territories > Argentina > New England

Each map generally takes anywhere from 15 minutes (if you have a higher rank on an easier difficulty or with a solid group of 2-3 teammate/syndicate members) or a full hour (if you are a lower rank attempting one of the maps on a harder difficulty).

As far as the actual format of each map, you will get objectives that require you to open gates, project UGV's, kill a seargent, etc. until you reach the final area of the level where you must face some type of boss. These bosses typically include either a heavy with a minigun or a group of 2-4 agents/mercenaries (varies depending on which difficulty/map you select). You will get checkpoints as you go, so if you die you will respawn back at the checkpoint allowing you to revise your strategy.

For efficiently playing through the coop, I would recommend playing each map in the order listed above on normal, then hard, then expert since developing weapon/research apps and completing challenges will take awhile anyways. Coop has alot of fun weapons and abilities that make it as fun (or in my own experience more fun) than the campaign so do yourself a favor and get familiar with all the maps on lower difficulties so that you will be pro by the time you are playing on expert !

If you have any questions, please message me but other than that, get a good group of 2-4 people and have fun with this!