How to get more skins for your character...

You have to play multiplayer to get those skins.Uspilon Forces - third skin Achieve COMMANDER

level (with a general average higher than 95%)

Uspilon Forces - second skin Achieve FIELD AGENT level (with a general average higher than 20%)

Spy - third skin Achieve SPECIAL AGENT level (with a general average higher than 45%)

Spy - second skin Achieve RECUIT level (with a general average higher that 1%)

Complete each of the following achievements below to get the allotted gamerscore.

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

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

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

-Teacher's Pet (40)
  In solo mode, successfully complete all of the training courses.

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

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

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

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

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

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

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

-FIELD AGENT (20)
  Obtain an overall characteristics average of over 20%.

-SPECIAL AGENT (25)
  Obtain an overall characteristics average of over 45%.

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

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

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

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

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

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

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

-Ellsworth Assignment Completed (30)
  In solo mode, completed the Ellsworth Penitentiary assignment.

-Iceland Assignment Completed (30)
  In solo mode, completed the Iceland assignment.