This confused me for a little bit since I may have skipped over the tutorial for it. In order to deploy war assets to different territories, you need to first complete a game of multiplayer.
After the match, you will go through the after match screens, showing loot and your level up progress. After that, you can click
to get to Next Match which is where you will see the option to "Deploy War Assets".
Once you click that, you are brought to the map and you can pick a territory to deploy to that is related to the faction you're sided with. Once you've selected a territory, the achievement should pop.
NOTE: This can be done after a PvP or PvCPU game. (thanks Craphex
This will also work you towards:
The Active Duty achievement in For Honor worth 75 pointsManually deploy War Assets in 50 different Turns. The Warmonger achievement in For Honor worth 50 pointsManually deploy War Assets on 10 enemy territories. The Protector achievement in For Honor worth 53 pointsManually deploy War Assets on 10 friendly territories. The A Reservist achievement in For Honor worth 26 pointsManually deploy War Assets in 5 different Rounds.