Here is the full list of all 10 Need to Know achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Reach Clearance Level 6.
Reach Clearance Level 7.
Reach Clearance Level 8.
Reach Clearance Level 9.
Reach Clearance Level 10.
Reach Clearance Level 5.
Reach Clearance Level 4.
Reach Clearance Level 3.
Reach Clearance Level 2.
Reach Clearance Level 1.