My friend and I have been playing Left 4 Dead Survival lately to get the achievement, "Legendary Survivor". That is where you have to get a gold medal on every official survival level (10 Minutes or more.) One of the levels we did which was, "The Bridge" in the Crash Course campaign, went well. We survived for 12 minutes or so with two AI's and it said we had received a gold medal. This was a total lie. We checked the achievement a day later (which lists what levels you have completed or not) and showed us that the map, "The Bridge", had not been completed yet. It even clearly shows in-game for both my friend and I that we have gotten 12 minutes and a gold medal on The Bridge. It is hard enough to get gold as is, but with 2 AI's that are utterly incapable of aiding us, it is near impossible (in our opinions.)
We just want to know what is going on with this problem. Any suggestions or solutions/ ideas would be appreciated.
We both join a Best Available Decicated Server everytime we play as well.
(Time and Map)http://steamcommunity.com/sharedfiles/filedetails/?id=122476341
(Map completion list)