Splinter Cell: Double Agent Cheats

Elite mode
Clear the Solo mode once.

Elite-Mode (Coop-Mode)
Beat the game in coop-mode to unlock coop-elite-mode.

Extra item/equipment
Complete the following objectives to unlock the extra stuff:

Electric Lock Pick: Primary objectives in JBA HQ 1.
EMP Device - enhanced: Primary objectives in JBA HQ 1.
EMP Grenade: Secondary objectives in Iceland Assignment.
EMP Grenade - attachment: Secondary objectives in 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 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 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 Ellsworth Assignment.
Wall Mine - Flash: Secondary objectives in Okhotsk Assignment.
Wall Mine - Stun: Secondary objectives in the Ellsworth Assignment.