Here are the six secret achievements you can unlock in Battlefield 3 for the Xbox 360.
Check out my other guide for the complete list of unlockable achievements in Battlefield 3.
FlashForward (10) – Completed Semper Fidelis
No Escape (30) – Captured Kaffarov
Shock Troop (15) – Survived the quake
This is the end (20) – Failed to prevent the attack
Wanted: Dead or Alive (20) – Captured Al Bashir
Where are the other two? (20) – Found the nuke