24 Oct 2019 25 Oct 2019
In the 3rd mission of the campaign, "Embedded" you will have to pick up a cinder block to pretend you are a worker, you must simply bring the cinder block with you to the end of the mission, which isn't too hard of a task if you take your time.
The achievement description is a bit misleading, "Only use one cinder block" does NOT mean you have to kill the enemies with only the block, you can drop the block to use your pistol or another weapon at any time or to complete other tasks in the mission such as setting explosives.
Note that you can not bring the cinder block up or down ladders, right before Farah instructs you to set explosives onto two helicopters she will tell you to follow her up a ladder, don't follow her and just make your way to the helicopters. Once you reach the end of the mission you will have to descend down a ladder into the tunnel, keep the block in your hands until you press X to go down the ladder, the mission will end and the achievement will unlock during the cutscene.