The achievements says complete the game in an amount of time trought the whole campaigne without dying otherwise you have to start from Chapter 1 again.
I saw and did some damn hard achievements in my time but this is one of the hardest i've seen. I reached to Chapter VII and then got killed because the enemy person was hidden during my last stand. No offence Rockstar but who made that achievement. I'm gonne woop his ass !
Do you really think i'm gonne complete the game 10000X , 1x Hard achievement , 1x Hardcore achievement , 1 old school achievement , 1x New York in 1 min . and then 1X the stupid hardcore NYM which i have to do again when i do .
I loved the singleplayer but i'm getting sick to see the cinematics over and over again without able to skip them.
Put that 20G achievement in ya damn **** rockstar.