RockstarELITEXX said:ok im new to this thread thing but i just wanted to know if any one else had this problem.i unlocked the achievement for beating the game on supersoldier diffuculty but did not got the half way to hell achievement did i miss something or is it glitched
It's a known glitch, and its happening to a lot of people. However, you got yours the good way around. Better this way, than not popping the final SS achievement for completing the game.
To get around it, transfer your save to a USB stick (so essentially your deleting your save), and replay the first three chapters. It should unlock.