Can't get achievements Invisible man, Rescue Ranger. I have passed Frontline level more then three times and get Hedge-hopper, but didn't get this 2 achievements. I saved red prisoners on Fascist's camp and saved red POW under the bridge on Red's camp. I do not know what's the problem.
Also I can't get Raider, Snake, Soft Touch and Thief. Is it bug? How can it be fixed?

I can't get the achievement "Clean", "DJ Artem".

I don't know if my problem is related to the problem of the other two posters, but I have been having problems with Metro 2033 Redux.

I wanted to test if any Achievements of that game are working for me, so I tried to earn the Achievement for "Who Goes There?" by wiping my gas mask 20 times.

I have done that more than 20 times, on many different occasions, and the Achievement never unlocks for me.

I'm not sure if all the other Achievements for this game are also bugged for me too (they may well be), but that one definitely is.

Is there any solution to this problem?