Here is the full list of all 23 Counter Terrorist Agency achievements.
Arrest innocent person
Kill non dangerous person
Suspect's assigned role matches the real role
Kill first suspect
Reveal all group members
Unlock all upgrades
Unlock all special units upgrades
Unlock all drone upgrades
Unlock all interrogation upgrades
Unlock all PR upgrades
Unlock all lobbing upgrades
Unlock all diplomacy upgrades
Unlock all hacking upgrades
Unlock all wiretap upgrades
Unlock all police upgrades
Prevent first attack
Perform successful interrogation.
Arrest first suspect
Unlock first upgrade
Uncover and analyse a dangerous group perfectly
Finish the game
Number of countries in CTA reaches 40
World reputation reaches 100%