Quick question, if I were to beat the game on Supersoldier will that also unlock the acheivements for Veteran? And is there a new game plus mode like in Dead Space, where all of our suit upgrades are carried over to a new game difficulty? Also I've been reading of people beating it on SS, but not getting the achievement, has it been patched/fixed already? Thanks.

All upgrades are transferred over, and if you want all the achievements, START the entire game over on super soldier, not the first level, you NEED the sub cut-scene.

Thanks for the reply. Just to clarify, So after beating the game and selecting new game mode plus, if I were then to select SuperSoldier, will it start from the beginning (sub cut-scene) and I will still be able to get the achievements with existing suit upgrades, or do I have to start an entire new game without the suit upgrades (non new game plus mode)? Thanks again.

Just start from the begining. my first playthrough was on Regular(normal) then when I beat it I went to Campaign menu, hit Replay Mission and picked the first mission( the submarine thing) and started on Super Soldier and went from their and got ALL my SS and Veteran achievements.

Yes, all achievements for veteran will be unlocked on Super Soldier, and you will always keep your modules and your attachments, although some attachments will glitch sometimes, like the pistol silencer.. No new game mode after Super Soldier, well at least not yet.