Intuitive Aptitude- original ability. (canon)
Telekinesis- Brian Davis. (canon)
Cryokinesis/Freezing- unknown. (canon)
Enhanced/Eidetic Memory- Charlie Andrews. (canon)
Liquification/Melting- Zane Taylor. (canon)
Superhuman Hearing- Dale Smither. (canon)
Precognitive Painting- Isaac Mendez. (canon)
Induced Radioactivity- Ted Sprague. (canon)
Illusion- Candice Wilmer (non-canon)
Poison Emission- Maya Herrera (non-canon)
Rapid Cellular Regeneration- Claire Bennet (in game-logged))
Hydrokinesis- unknown NYC mugger/junkie (in game-supposed)
X-Ray Vision- unknown NYC mugger/junkie (in game-supposed)
Electrokinesis- unknown NYC mugger/junkie (in game-supposed)

There are six other abilities that Sylar may have but have not been shown. Mohinder mentions that Sylar killed at least six people off his father's list prior to him killing Zane Taylor.