I apologize for taking a while to get this up for you guys but here are the requirements for the Marksman, Sharpshooter, and Expert badge if you so choose to complete them through Rainbow Six.
Marksman
Terrorist Hunt
1. Choice of operator and weapon
2. Must win 10 matches on normal
3. Must have atleast 5 kills with no deaths
4. Must be paired off with a Full CAG Member to confirm the games
5. Must provide image if possible
-OR-
Multiplayer
1. Win 5 matches of Multiplayer
2. Have atleast 3 kills with no more than 1 death
Sharpshooter
Terrorist Hunt
1. Choice of operator and weapon
2. Must win 15 matches on Hard, or 10 matches on realistic
3. Must have atleast 7 kills with no deaths
4. Must be paired off with a Full CAG Member to confirm the games
5. Must provide image if possible
-OR-
Multiplayer
1. Win 10 matches of Multiplayer
2. Have atleast 4 kills with no more than 1 death(casual), or no more than 2 deaths(ranked)
Expert
Terrorist Hunt
1. Choice of operator and weapon
2. Must win 20 matches on Hard, or 15 matches on realistic
3. Must have atleast 10 kills with no deaths
4. Must be paired off with a Full CAG Member to confirm the games
5. Must provide image if possible
-OR-
Multiplayer
1. Must win 15 matches on Multiplayer
2. Have atleast 5 kills with no deaths(casual), or no more than 1 death(ranked)
You DO NOT have to do both the Multiplayer and Terrorist Hunt requirements to obtain the badge. It is your decision to complete it using either the TH or MP option. As well as the Terrorist Hunt option the Multiplayer option must have a full CAG member in the lobby with you to confirm the games.