I was wondering if anyone has any insight into my particular situation here.
A friend and I went through the Gravemind mission on legendary with no x0 modifiers on and picked up the Anger skull in this level. Neither of us got the achievement for the skull.
Later, after reading numerous discussions on how the x0 modifiers doesn’t affect collectibles during the missions, I decided to run through the Gravemind mission on legendary again with just the Scarab skull turned on. I can get to the skull and pick it up but it will not unlock the achievement. I’ll load last checkpoint and make it to the skull over and over again but with no luck. I’ve also tried starting the mission over again from the beginning and the game refuses to unlock the achievement no matter what I do.
Is anyone else experiencing this, and if so, were you able to figure out how to get the achievement to unlock? Any thoughts on this issue?