OK so me and my friend are doing the co op, well Im helping him because he wants to do the kait but I decided to do the pick me up achivement which is complete the campaign on hardcore or higher without killing an enemy with lancer or Gnasher. I’m doing it on hardcore and he’s doing it on normal but hes still using the Gnasher and lancer will it still count for me?
According to TrueAchievements comments for this achievement, neither player can use a Gnasher or Lancer in a co-op run for Pick Me Up. You would still get progress if he’s on a lower difficulty, though. This achievement tracks progress, you should be able to see the percentage increase as you complete chapters.