Note:- This game is also known as - Splinter Cell: Double Agent

Bonus multiplayer skins - Successfully complete the indicated task in Multiplayer mode to unlock the corresponding skin:

Spy (second skin): Achieve the "Recruit" rank (with a general average higher that 1%)
Spy (third skin): Achieve the "Special Agent" rank (with a general average higher than 45%)
Uspilon Forces (second skin): Achieve the "Field Agent" rank (with a general average higher than 20%)
Uspilon Forces (third skin): Achieve the "Commander" rank (with a general average higher than 95%)

Bonus equipment - Successfully complete the indicated special objectives in Solo mode to unlock the corresponding item:

Electric Lock Pick: Primary objectives in JBA HQ 1
EMP Device - Enhanced: Primary objectives in JBA HQ 1
EMP Grenade: Secondary objectives in the Iceland Assignment
EMP Grenade - Attachment: Secondary objectives in the Cozumel Assignment
Explosive Sticky Camera-Attachment: Secondary objectives in the Iceland Assignment

Frag Grenade - Attachment: Primary objectives in JBA HQ 3

Gas Grenade: Primary objectives in JBA HQ 1
Gas Grenade - Attachment: Secondary objectives in the Cozumel Assignment

Hacking Device - Force Hack Upgrade: Primary objectives in JBA HQ 2
Hacking Device - Software Upgrade: Secondary objectives in the Shanghai Assignment

Night Vision - Enhanced: Primary objectives in JBA HQ 3

Shotgun Shell - Attachment: Secondary objectives in the Okhotsk Assignment
Smoke Grenade - Attachment: Secondary objectives in the Shanghai Assignment
Sonic Grenade - Attachment: Primary objectives in JBA HQ 2

Ultrasonic Emitter: Secondary objectives in the Ellsworth Assignment

Wall Mine - Flash: Secondary objectives in the Okhotsk Assignment
Wall Mine - Stun: Secondary objectives in the Ellsworth Assignment

Alternate endings - Successfully complete the following tasks to get the corresponding ending:

Elite mode - Successfully complete Solo mode on any difficulty setting to unlock the Elite difficulty setting.

Ending A - Good: Have your NSA trust above 33% and save at least two of the three targets (Crouse Ship, Hisham, Lambert).

Ending B - Normal: Have your NSA trust below 33% and save all three targets (Crouse Ship, Hisham, Lambert). Alternately, have your NSA trust above 33% and destroy two of the three targets.

Ending C - Bad: Destroy all three targets (Crouse Ship, Hisham, Lambert). Alternately, have your NSA trust below 33% and destroy two of the three targets.