Speaks English, Italian, Russian, Spanish, French, and American Sign Language. Also knows morse code.
Is an expert marksman with any projectile weapon, from his preferred bow to any kind of fire arm. He can make shots that would otherwise be impossible and with very little effort. He also has the knowledge to know how to work most fire arms, whether or not he's used them on previous occasions.
Also has excellent aim with thrown weapons, from ping pong balls to throwing stars and can throw them with extreme speed and accuracy, both in direct throws and with complicated trick shots.
Is an expert acrobat. He possesses exceptional human strength, endurance, and stamina, with very good reflexes and agility. He is also an expert martial artist and, while he much prefers to do his jobs from a distance, can more than handle himself in hand-to-hand situations.
Is an expert tactician. While he has no great desire to lead a team of his own and is happy following Steve and being Natasha's partner, he does know how to strategize.
He can also drink a shitton of coffee in one sitting. This is definitely a notable skill.