Ending A (Good Ending) - NSA trust above 33%, save two of the three targets
Ending B (Normal Ending) - Have NSA trust below 33%, and save all three targets, or save one target with NSA trust above 33%
Ending C (Bad Ending) - Destroy all three targets, or destroy two of the three targets with NSA trust under 33%.

Multiplayer Skins

Entry Location:
Skins are unlocked in multiplayer.

Spy: 2nd skin - Achieve Recruit level (with a general average higher that 1%)
Spy: 3rd skin - Achieve Special Agent level (with a general average higher than 45%)
Uspilon Forces: 2nd skin - Achieve Field Agent level (with a general average higher than 20%)
Uspilon Forces: 3rd skin - Achieve COMMANDER level (with a general average higher than 95%)

Unlock All Multiplayer Maps

Play 25 total games and win at least 6 as a Spy and 6 as a UPSILON Force member.

Achievements

Training Completed (10 points) - In Solo mode, successfully complete a training course.

Teacher's Pet (40 points) - In Solo mode, successfully complete both training courses.

Hero (20 points) - In Solo mode, complete the game with the best ending.

The Invisible Man (20 points) - In Solo mode, complete a mission without being detected.

Getting Technical (20 points) - In Solo mode, knock out 5 enemies using non-lethal gadgets.

The Collector (20 points) - In Solo mode, collect all gadgets and upgrades.

The Human Light Switch (20 points) - In Solo mode, use your EMP Pistol to turn off 20 light sources.

Professional Ninja (40 points) - Complete Solo mode on Hard difficulty.

Agent of the Month (20 points) - Complete the profiles of all the major members of the JBA.

Recruit (10 points) - Obtain an overall characteristics average of over 1%.

Operative (15 points) - Obtain an overall characteristics average of over 5%.

Field Agent (20 points) - Obtain an overall characteristics average of over 20%.

Special Agent (25 points) - Obtain an overall characteristics average of over 45%.

Officer (30 points) - Obtain an overall characteristics average of over 75%.

Commander (45 points) - Obtain an overall characteristics average of over 95%.

Bronze Trophy (15 points) - Complete all the challenges by obtaining at least the bronze medal.

Silver Trophy (30 points) - Complete all the challenges by obtaining at least the silver medal.

Gold Trophy (50 points) - Complete all the challenges by obtaining at least the gold medal.

Blackwing Expert (20 points) - Get at least 10 victories as a spy and 10 in the UPSILON FORCE and play 25 sessions in this map.

Motorway 90 Expert (20 points) - Get at least 10 victories as a spy and 10 in the Upsilon Force and play 25 sessions in this map.

Terminus Expert (20 points) - Get at least 10 victories as a spy and 10 in the Upsilon Force and play 25 sessions in this map.

Slaughter House Expert (20 points) - Get at least 10 victories as a spy and 10 in the Upsilon Force and play 25 sessions in this map.

Red Diamond Expert (20 points) - Get at least 10 victories as a spy and 10 in the Upsilon Force and play 25 sessions in this map.

Boss House Expert (20 points) - Get at least 10 victories as a spy and 10 in the Upsilon Force and play 25 sessions in this map.

Dawn Waves Expert (20 points) - Get at least 10 victories as a spy and 10 in the Upsilon Force and play 25 sessions in this map.

USS Wisdom Expert (20 points) - Get at least 10 victories as a spy and 10 in the Upsilon Force and play 25 sessions in this map.

Tom Clancy's Splinter Cell Double... Hints

Secret Achivement #2

Entry Location:
Kinshasa

When you get to the radio tower and get the sniper rifle shot the other man besides Hisham. Two other men will run in and shot them too. The tower will go up and you will go to Kinshasa part 3. Go down the zipline and go into the bus (watch for mines), then go into the helicopter through the pipes. After you take out the front guard go to your left and cut the glass. Free Hisham and escort him out the back. Then boost him over the fence to the left to get the "Save Hisham" achievement for another 10 points.

Submitted By: drlgamer

Secret Achivement

Entry Location:
NYC - JBA HQ - Part 4

In the beginning you have to follow Emile. He will bring you and Jamie into the room with Lambert tied up. Emile hands you his Luger and tells you to shoot Lambert then leaves. Shoot Jamie Washington to get the "Save Lambert" achievement for 10 points. (Also scan Jamie after you kill him then go to the armory to get a gun and night vision goggles).

Submitted By: drlgamer