Left 4 Dead: What Are You Trying To Prove? achievement

[Tek7]

I know at least a few Tribe of Judah members still need to clear at least one more campaign on Expert to earn the What Are You Trying To Prove? achievement (earned when a play clears all four campaigns on Expert difficulty).

If you're interested in teaming up with other Tribe of Judah members, post which campaigns you still need to clear to earn the achievement.

If you've earned the achievement but are interested in helping other members earn the achievement, post a reply.

 

[Tek7]

I've earned the achievement, but I'm interested in helping others clear Expert difficulty campaigns.

 

[Annath]

I think I need all four campaigns, although I will have to check.

 

[Omega Amen]

I would need all four campaigns as well. I am also up for helping people get achievements.

 

[BassMan449]

I need Dead Air and Blood Harvest. And I need to actually survive the finally with my teammates on both.