Army of Two
47 Achievements
1,250
51-64h
Starting a Riot
Kill 50 enemies total in Co-op Riot Shield.
30
How to unlock the Starting a Riot achievement in Army of Two - Definitive Guide
You will need to be behind your co-op friend when he has the shield and you will need to kill a total of 50 enemies (as the achievement said).
This achievement also is the one you most likely will not get during the course of the game, unless you put a major focus on it.
My favorite spot for both of the shield achievements is on the Aircraft Carrier. As you progress through the level you will reach a check point and will see a riot shield in the corner of the same hallway before going outside on a narrow walkway. There will be several enemies come out at you, once you kill them all reload the check point (DON'T GO INTO THE DOOR AT THE OTHER END OF THE WALKWAY). It will only take about 4-8 reloads depending how many you have killed in the duration of the game.
This is the only single player campaign achievement that can not be gotten without a second controller/human partner. You have to be the one behind doing the shooting while your partner holds the Riot Shield to get this. I recommend doing it on Mission 2, Afghanistan on Casual difficulty. There is a part in the level where you are in some corridors filled with gas. There's a riot shield right outside the lift you come out from. Have one player pick up the riot shield and one behind doing all the shooting. Take the left path and circle clockwise. You can easily get at least 12 kills before the shield breaks. Once it breaks, restart from checkpoint and you will be outside the lift again. Do this 4-5 times to get this achievement.
This is the only single player campaign achievement that cannot be gotten without a 2nd controller/human partner. You have to be the one behind doing the shooting while your partner holds the Riot Shield to get this. I recommend doing it on Mission 2, Afghanistan on Casual difficulty. There's a part in the level where you are in some corridors filled with gas. There's a riot shield right outside the lift you come out from. Have one player pick up the riot shield and one behind doing all the shooting. Take the left path and circle clockwise. You can easily get at least 12 kills before the shield breaks. Once it breaks, restart from checkpoint and you'll be outside the lift again. Do this 4-5 times to get this achievement.