Unlock Weapons (Single Player)
SEAL Weapons - Finish the game on Ensign. Terrorist Weapons - Finish the game on Lieutenant.
SAS Weapons - Finish the game on Commander.
Spetsnaz Weapons - Finish the game on Commander.
MGL (Multiple Grenade Launcher) - Finish the game on Captain.
OICW - Finish the game on Admiral.

Unlock Art/Production (Art Gallery)
Finish the game on Commander.

Unlock Characters
Sabre - Finish the Albania missions on Commander.
Reaver - Finish the Algeria missions on Commander.
Algerian Officer - Finish the Algeria missions on Lieutenant.
Pius Platz - Finish the Albania missions on Lieutenant.
Feral - Finish the game on Admiral.
Quixada Christo - Finish the Brazil missions on Commander.
The Specialist (Flatfoot) - Finish the Russia missions on Commander.
Valeska Lukanov - Finish the Russia missions on Lieutenant.

Unlock Credits
Finish the game on Ensign or above.

Unlock Jukebox Songs
SOCOM II Online Theme - Already unlocked.
Contortion - Finish the game on Lieutenant.
Tari Tari - Finish the game on Lieutenant.
KGM - Finish the game on Lieutenant.
Gnostec - Finish the game on Lieutenant.
Dance of the Unknown - Finish the game on Lieutenant.
Insertion Suite - Finish the game on Lieutenant.
Infiltrator - Finish the game on Lieutenant.
Dark in Your Heart - Finish the game on Captain.
Beach Bossa - Finish the game on Captain.
Brazilicious - Finish the game on Captain.
SOCOM II Finale - Finish the game on Captain.

Unlock Movies
Albanian Intro Movie - Already unlocked.
Brazilian Intro Movie - Finish the Albania missions.
Making the SOCOM II Music Movie - Finish the game on Lieutenant.
Algerian Intro Movie - Finish the Brazil missions.
Russian Intro Movie - Finish the Algeria missions