There are far too many to easily name going by variations, so I'm just going to throw out a few mainline variation names and anyone who's willing to add to my list can do so:
Old Sicilian mainline with 2...Nc6 and 6.Bg5
Sveshnikov/Kalashnikov
Scheveningen
Najdorf (which itself has tons of variations)
Dragon
Accelerated Dragon
Hyper-Accelerated Dragon
Sicilian Four Knights
Kan
Taimanov/Paulsen
There's plenty more, but I think those are most of the major branches
Oh, and then there's everything that doesn't fall under the 'Open' variation category:
Rossolimo variation
Whatever the name for the 2.Nf3,d6 3.Bb5+ variation is
Closed Sicilian
Grand Prix Attack
Alapin (which itself has at least two main variations, 2...d5 and 2...Nf6)
Delayed Alapin (2.Nf3 and 3.c3)
Chameleon variations (2.Ne2...often transposes to other systems)
King's Indian Attack
Smith-Morra Gambit
Wing Gambit
Some more oddball tries that aren't seen very often (such as 2.b3)
Again, hardly exhaustive, but gives you an idea of all the kinds of lines you have to be prepared to meet playing the Sicilian as black

Due to my d4 and french defense repertoire, I have almost no knowledge on any variations of any of the Sicilians (the only Sicilians I know the opening moves to is the Dragon and the Najdorf), but I know there is a lot more than that. Can anyone please post the opening moves, and move orders, to some of the mainline Sicilian positions, as I am thinking of starting a new black defence to e4.
Also I am more of an attacking player, and am fairly good at tactics, however I don't want to learn too much theory.. so if there are any lines like that, they would be perfect :)
Thanks in advance :)