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