Never really wanted to play on mercenary difficulty, yet you wanna achievement? No problem.
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This "mod" is one mission away from unlocking Steam achievement for beating game on highest difficulty.
There is "free mission" option when you start the game. Chose mercenary difficulty and first mission as well as best plane possible. Or worst. Your pick.
Beat the mission and achievement should unlock.
Why are you just giving away your save file?
Look at my profile, this isn't first game I have put save files on nexus.
Since its not like I can test it again if it gives you achievement, this is untested save file. No one comented if it works but I got some endorsements so I guess it does.