Would it make sense to split these achievements up between the episodes? Would make sorting them by which episode you need to play for the achievement really easy. Some of their descriptions don't do a great job pointing out which one they are from.
For example, this one:
You need to be playing episode 2 for the kills to count towards it, I spent awhile in episode 1 yesterday very confused why it wasn't popping until I looked at the achievements for each episode to check which one it was from.