Just open with Horizon or Modio rehash/resign iDs profile iD and Device iD
Do mission 15 for last Rorke file... thats it... Enjoy your Achievement
Collect all 18 Rorke files.
Mission 15 - All or Nothing
[Objective: Get to the Flight deck]
Immediately after the mission starts, turn around and look
for this Rorke File in one of the bunks.
It May or may not pop other achievements.