There are two 5-level Escalation Contracts in Paris available in HITMAN 2: "The Teague Temptation", and "The Videl Cataclysm". Out of the two, I think that The Teague Temptation is the most straightforward. The other two Escalations in Paris only have 3 levels and unsurprisingly they don't count.
You do not have complete them with a Silent Assassin rating, you just have to complete the objectives of all levels and make it to an exit.
However, here is a text guide to SA rating in each level of The Teague Temptation:
*** Spoiler - click to reveal ***
The Teague Temptation:
Level 1: Start as Tech Crew (Mastery Level 7), you'll need coins in your loadout. Skip most of the load-in animation (so that NPCs don't continue their routes as much) and run up to the target. He and his buddy should be just about to start walking again. Let them both walk a few paces, and bump into the target to keep him nearby while his buddy will continue the route. Now place ( + ) a coin on to the banister so the target will get close to pick it up. As the target nears the banister the Push prompt should show up, so press to push him over the banister to the floor below. Run back towards the starting location, down the staircase all the way to the basement and exit via the catacombs.
The coin trick can be a little finicky, but you should be able to get it within a few tries.
Level 2: This level adds a Big Brother complication. This means extra cameras, but none are on the route we're following, so just do the same as Level 1 again.
Level 3: This level adds another target - the security guard at the starting location. Continue as before, but this time after pushing target #1 you'll need to find a letter opener. First head west into the big room nearby and then run south into the smaller, elongated adjacent room. You'll find a letter opener sitting on the desk. Grab it and retrace your steps towards the starting area. Hopefully by now target #2 will be in the bathroom, although if not it just means a little bit of waiting. To get to the bathroom we're going to run past the entrance to the staircase and go through the hallway that has a couple CICADA bodyguards patrolling so we can avoid the cameras. Wait in the bathroom for target #2 to arrive, close the door behind him, stab him with the letter opener, put his body in the closet (although I don't think anyone else goes in there, so you can probably get away with skipping that), and again retrace your steps through the hallway to the staircase and go down and exit as before.
Level 4: This level adds a No Pacifications complication. However, since we're not pacifying anyone anyway, just do the same as Level 3 again.
Level 5: This level adds a No Disguise Change complication. However, since we're not changing disguises, just do the same as Level 3 yet again.