Virtual Training

Virtual Training is a new feature offered by the Animus in AC: Brotherhood. They rank you on a scale of bronze, silver, and gold. While some can be easy, many will require a high level of skill. Getting bronze in all of the events will grant you the Raiden Armor from Metal Gear Solid, quite snazzy.

Combat

These will test your reflexes. You will have to get used to the execution streaks. To perform the execution streaks, highlight an enemy, then press x immediately after an execution to perform another. Watch for someone attacking, which may force you to counter-attack. On the flawless challenges, counters will be helpful, but dodges will be more helpful here than usual. If you have a choice of all your weapons, use your sword and hidden gun.

Race

When going about a race, select a path that won't force you to backtrack. I would recommend walking through the course first, so you can find the best route to take. Cut corners when possible, and never stop moving. Constantly be free running to maximize time effectiveness. These are fairly easy in my opinion, and you should be able to get at least bronze, if not silver or gold, on all of them.

Stealth

The objective of stealth is to assassinate all guards without gaining notoriety. The guards will only notice you if you get in front of them, so taking them out from below, above or behind will be a necessity. If you are doing the "All Weapons" mode, then using a crossbow at range is the way to go. If you use a crossbow you can risk getting in front of them momentarily. If you are doing hidden blade only, then you will have to have a much sneakier approach. I'd recommend taking them out from below, as there will be no way they will see you. If you are on a ledge and they are out of your range, hold RT and press X. This will allow you to jump up and assassinate the target.

Flag Hunt

Flag Hunt is a re-creation of the Borgia flags in normal single player. The flags almost have hidden status. Use your radar to determine if they are on your level, or above or below you. It looking the normal, light blue, will denote on your level. It looking a faded, darker blue, will denote above or below you. You may have to find the location of each flag before you attempt it. Now, when going about collecting flags, get the ones on the outside first. Never make yourself need to backtrack.