For achievments to unlock you must load this save on a profile that has 0 achievement or has never played the game before.. After load it will pop 590gs. The achievements will also pop if you only have the first few achievements in the game.
Billion Dollar Babies
do the level 3 winching challenge 1 or 2 times and the Achievement pops
...And Justice For All and The Hero and the Madman
bet the mission you are on and you will get verified all high value targets and completed Mercenaries 2 Achievements