The following list contains more elaborate hints for all 19 achievements. The following list contains spoilers!
Filing Genius - Find the information in Sevastopol on the first try. It's always in the same drawer.
Ghost - Go through Sevastopol without being spotted once.
Soviet Strength - Get in a car during the Sevastopol escape and rush the checkpoint.
A Curious Mind - Go into Remi's room and search for him.
Better Safe Than Sorry - Leave Remi's hotel room as soon as possible.
Our Man in Bulgaria - Make contact with Arseny Speransky. A milestone achievement.
All Your Information Are Belong To Me - Strike a deal with Metaxas and get all of the information he has to offer.
Feel the Burn - Share classified operational information with Metaxas.
One-man SMERSH - Kill the Soviet agent sent after you.
Roman Holiday - Become intimate with Evony Lellouche.
Keep it Classy - Share a bed with Evony Lellouche, but refuse to do anything more.
Ruthless - Kill Evony Lellouche.
From France with Love - After the Baccarat game convince Evony to flee while she can - for your sake.
The Spy Who Loved Me - Share a bed with Brandon Ides.
Judo Chop! - Knock someone, anyone, out with a single blow.
Honour to the Service - Find all the information regarding the diamond smuggling ring and turn it in to the people who burned you.
Traitor to France - End the game as an unredeemed burned agent and a traitor to your country.
Agent Retraité - Accept Brandon Ides' opportunity and take up a new identity away from the spy game.
Full Circle - Accept Brandon Ides' opportunity, take on a new identity and join a new assignment in the Far East.