So, beat the game in less then 8 hours in Normal did you? Well, I didn't lol. So to get this achievement do you have to beat the game in less then 8 hours without no retrys or can you go back and re-do missions to get under the 8 hour mark?
I've heard that you could do replays, but I'm really not sure. I just found it much easier to restart and do solely the crucial missions to get to Char as fast as possible (My exact order was the Mar Sara missions, then Tychus' Smash 'n Grab, Tosh's The Devil's Playground and Welcome to the Jungle, then The Great Train Robbery and Cutthroat, all four of Zeratul's missions [to nab all the Zerg and Protoss research], and then I finished up the artifact missions [The Moebius Factor through Maw of the Void], and ended with the Char missions. My final time was about 6 and something hours I believe. It really wasn't too hard to make the time on normal, and if you think you messed up time wise, just restart the mission before you complete it. I hope that helped.
For the record I completed the campaign, went back to replay the missions and shave minutes off each mission, and have not gotten the achievement even though my total time is now down to about 7 hours. So I'm guessing it's like the previous post, before completing the mission you'll need to have the time down.
I'm pretty sure you can't replay missions. From what I've read, no one has gotten it through replays. Quickest way is to just play the required 19 missions (I think?) to finish the game and go through it as fast as you can. You should easily get under 8 hours. Or you can just download a save file from someone right before they got the achievement. There's a few around.
what if I have finished the brutal&hard difficult ? I don't finish some mission in normal, can I play them in normal to get the achievement?
