Here is the full list of all 27 Undercover Agent achievements.
Flirt at the party.
Plant a tracker on a car.
Confront the mole.
Have Kang "taken care of."
Enjoy the show.
Tell Helen that you work for the DTU.
Speed up the security program on the Bishop Industries computer.
Have the DTU raid the offices of Bishop Industries.
Kill at least five people.
Frame someone who cares about you.
Stow away on Silas's boat.
Rescue Elijah.
Talk your way through the sale.
Fall in the line of duty.
Destroy the weapon.
Deliver the weapon to the DTU.
Escape the Golden Coral empty-handed.
Be promoted to Chief of Counterintelligence at the DTU.
Never call in Antonio's favor.
Join Silas.
Run with the one you love.
Complete the mission with no wounds.
Romance Karl.
Romance Helen.
Romance Antonio.
Romance Sam.
End the game alone.