Here is the full list of all 38 Tom Clancy's Splinter Cell Double Agent achievements worth 1,000 gamerscore.
You have become an expert in reconnaissance in the USS WISDOM map
You have become an expert in reconnaissance in the RED DIAMOND map
You have become an expert in reconnaissance in the SLAUGHTER HOUSE map
You have become an expert in reconnaissance in the DAWN WAVES map
You have become an expert in reconnaissance in the MOTORWAY 90 map
You have become an expert in reconnaissance in the BOSS HOUSE map
Your capacities have enabled you to attain the rank of OFFICER
You have become an expert in reconnaissance in the BLACKWING map
You have become an expert in reconnaissance in the TERMINUS map
Your capacities have enabled you to attain the rank of SPECIAL AGENT
Your capacities have enabled you to attain the rank of FIELD AGENT
Your capacities have enabled you to attain the rank of OPERATIVE
Your capacities have enabled you to attain the rank of RECRUIT
In solo mode, successfully completed a training course
In solo mode, successfully completed both training courses
In solo mode, completed the Iceland assignment
In solo mode, completed the Sea of Okhotsk assignment
In solo mode, completed the Shanghai assignment
In solo mode, completed the second terrorist HQ assignment
In solo mode, knocked out 5 enemies using non-lethal gadgets
In solo mode, completed the game with the best ending
In solo mode, completed the main storyline
In solo mode, saved Lambert's life
In solo mode, completed the Kinshasa assignment
In solo mode, saved Hisham's life
In solo mode, used your EMP Pistol to turn off 20 light sources
In solo mode, completed the third terrorist HQ assignment
In solo mode, completed the Cozumel assignment
In solo mode, completed a mission without being detected
In solo mode, completed the first terrorist HQ assignment
In solo mode, completed the Ellsworth Penitentiary assignment
In solo mode, collect all gadgets and upgrades
Complete solo mode on Hard difficulty
Complete the profiles of all the major members of the JBA
Obtain an overall characteristics average of over 95%
Complete all the challenges by obtaining at least the bronze medal
Complete all the challenges by obtaining at least the silver medal
Complete all the challenges by obtaining at least the gold medal