Successfully beat the main storyline once to unlock this mode which makes enemies even tougher than the Hard difficulty and only gives you your OCP Pistol and a knife but no SMG.

To unlock the following items for Single Player mode complete the corresponding special objectives.

Unlock Electric Lock Pick:
Complete the primary objectives in JBA HQ 1

Unlock EMP Device - Enhanced:
Complete the primary objectives in JBA HQ 1

Unlock Hacking Device - Force Hack Upgrade:
Complete the primary objectives in JBA HQ 2

Unlock Frag Grenade - Attachment:
Complete the primary objectives in JBA HQ 3

Unlock Gas Grenade:
Complete the primary objectives in JBA HQ 1

Unlock Sonic Grenade - Attachment:
Complete the primary objectives in JBA HQ 2

Unlock Night Vision - Enhanced:
Complete the primary objectives in JBA HQ 3

Unlock Gas Grenade - Attachment:
Complete the secondary objectives in the Cozumel Assignment

Unlock Hacking Device - Software Upgrade:
Complete the secondary objectives in the Shanghai Assignment

Unlock Shotgun Shell - Attachment:
Complete the secondary objectives in the Okhotsk Assignment

Unlock Smoke Grenade - Attachment:
Complete the secondary objectives in the Shanghai Assignment

Unlock EMP Grenade:
Complete the secondary objectives in the Iceland Assignment

Unlock EMP Grenade - Attachment:
Complete the secondary objectives in the Cozumel Assignment

Unlock Explosive Sticky Camera-Attachment:
Complete the secondary objectives in the Iceland Assignment

Unlock Ultrasonic Emitter:
Complete the secondary objectives in the Ellsworth Assignment

Unlock Wall Mine-Flash:
Complete the secondary objectives in the Okhotsk Assignment

Unlock Wall Mine-Stun:
Complete the secondary objectives in the Ellsworth Assignment

Unlock ALL Multiplayer Maps
Win 6 games as a Upsilon Force member, Win 6 games as a Spy and play a total of 25 games.


Unlockable Skins
Play Multiplayer and get the following achievements to unlock the corresponding skins.

Unlock Spy - 2nd Skin:
Achieve Recruit Level with a general average higher than 1%.

Unlock Uspilon Forces - 2nd Skin:
Achieve Field Agent Level with a general average higher than 20%.

Unlock Spy - 3rd Skin:
Achieve Special Agent Level with a general average higher than 45%.

Unlock Uspilon Forces - 3rd Skin:
Achieve Commander Level with a general average higher than 95%. Unlocking the 3 Different Endings

To unlock the the different endings when the bomb is disarmed in the last mission complete the following scenarios.

Unlock Ending A - Best:
NSA trust above 33% and managed to save at least two of the three targets.

Unlock Ending B - Standard:
NSA trust below 33% and managed to save 3 targets. Or destroy two of the three targets have NSA trust above 33%.

Unlock Ending C - Worst:
Destroy ALL 3 targets Or Destroy two of the targets and have NSA trust below 33%.