My first save file had everything completed, so I decided to start a second one. Sadly that meant I had to do Hell on Wheels again
. Luckily I managed to go through and do the missions 100% sync on the first try. I didn't use the "cheat" at the end of the mission like a lot of people mentioned, I just didnt stop moving
and it was perfectly fine. You just have to be careful to not get hung up on some of the debris in the middle of the end area.
And I also already had 100% on the main game before the DLC was released. So I was glad they added the achievement
Retail 100% - Assassins Creed, Assassins Creed II, Assassins Creed: Brotherhood, Oblivion, Skyrim, Sleeping Dogs, Resident Evil 4
Arcade 100% - Plants vs. Zombies, Minecraft
Currently Playing: Dead Space 3, Far Cry 3, Sleeping Dogs