Desperados III: Money for the Vultures - Part 3: Once More With Feeling Review (paul)
This is a good bonus level DLC, and a good post-script conclusion to our protagonists' story.
As far as I can tell, the badges you win on this, and the other DLC levels, do not count to the Sheriff's Badge achievement for earning 90 badges. Some may consider that a mark against the DLCs. After all, a badge is a badge; and some extra help getting that achievement would be nice.
Nonetheless, think how many DLC achievements you've seen for bad, over-priced DLCs, lumped in with the base game's achievement list. Having those be a roadblock to that perfect 100% achievement game is no fun. This isn't quite the same thing. But still, having owning the DLC making a marked difference to your ability to get 90 badges, and 100% the game, isn't too far off from that.