Hey i got some questions

Hey i got battlefield 5 a couple days ago and i am actually enjoying it a fair amount but I have a couple questions i was wondering about

1. So i have been playing alot of assault and i really like the robeyrolles and have managed to get to the mastery VI assignment, But it is literally so impossible for me and it just seems like a load of bullshit, "Kill 10 enemies while attacking objectives in one life, or kil 20 enemies while attacking objectives in one round" I find this impossible and I've read the other masterys are kinda bullshit and stupidly hard, is there any acknowledgment from dice about fixing these? Or toneing them down a bit

2. In your opinion does vibration affect aim? I have decent aim but there are times where i choke in gunfights i know i could have one anyone have any tips to help with aiming? Thanks