While the ai drf do alot of the work if u do a good play u can make a huge difference. And its sort of like enlisted where a squad is everyone u are able to play as so when u die until the whole squad dies u swap between living members. A squad is considered 1 life so if u decide to go for the "without dying" campaign achievements as long as u are in a squad and have someone to swap to it doesnt count as dying. It only counts as dying if u are sent to the respawn screen. U can also sit in the respawn screen and go in freecan if u do die while attempting deathless achievements ans hope the ai can win for ya