With the campaigns of the available games done, my friend and I plan to tackle some of the extra achievements.
I.e. "Look Out for the Little Guys", which requires to complete Two Betrayals on Legendary without killing any Grunts. If we jump into coop and he kills all grunts while I concentrate on other enemies, will I be getting this achievement? Similar to "Leave It Where It Lay", where on Two Betrayals on Legendary, we are not allowed to pick up any new weapons. If I pick up any weapons while he keeps the starting weapons, will he be getting the achievement?
So can one player in the session work on an achievement while the other player "ignores" it?