This list consist of all (or at least most of them) the people that Luffy and the crew or were helped by them in the series. This includes the 8 members of the crew when they weren't officially part of the crew at that point.
Romance Dawn: Shanks, Coby, Zoro
Orange Town: Nami
Syrup Village: Usopp, Kaya, Nami
Baratie: Zeff, Sanji
Cocoyashi Village: Nami, Nojiko, Genzo
Loguetown: Dragon
Warship Island: Apis, Ryu
Reverse Mountain: Laboon, Crocus
Whiskey Peak: Vivi, Igaram
Little Garden: Dorry, Broggy, Vivi
Drum Island: Chopper, Kureha, Dalton, Vivi
Alabasta: Vivi, Cobra, Pell, Chaka, Kohza, Ace, Robin
Goat Island: Zenny
Ruluka: Henzo, Pasqua, Isoka, Rongo, Pukau, Akibi
Jaya: Blackbeard, Cricket
Skypiea: Conis, Gan Fall, Wiper
G8: MY MAN CONDORIANO, Jessica, Mekao
Davy Back Fight: Tonjit
Foxy's Return: Foxy
Water 7: Iceburg, Kokoro, Tom, Paulie, Usopp
Enies Lobby: Franky, Kokoro, Robin, Sogeking, Usopp
Lovely Island: Puzzle, Stansen
Thriller Bark: Brook, Lola
Spa Island: Sayo, Lina
Sabaody Archipelago: Rayleigh, Shakky, Law, Kid, Keimi, Hatchan, Duval, Kuma
Amazon Lily: Boa Hancock, Marguerite, Nyon
Impel Down: Boa Hancock, Buggy, Galdino, Emporio Ivankov, Jinbe, Crocodile, Bentham
Marineford: Ace, Whitebeard, Marco, Buggy, Galdino, Emporio Ivankov, Crocodile, Jinbe, Law
Post War Arc: Ace, Sabo, Jinbe, Law, Dadan, Boa Hancock, Rayleigh, Dragon, Heracles, Mihawk, Perona, Haredas, Vegapunk, Emporio Ivankov
Return to Sabaody: Rayleigh, Shakky
Fishman Island: Keimi, Shirahoshi, Neptune, Jinbe
Punk Hazard: Law, Smoker, Tashigi, Brownbeard, Kine'mon, The Little Demon aka Momonosuke (Aokiji)
Caesar Retrieval: The Dugong, Law
Dressrosa: Law, Kin'emon, Sanji's future stepping stool aka Momonosuke, Rebecca, Violet, Bartolomeo, Bellamy, Kanjuro, Sabo, Koala
Zou: Law, Carrot, Wanda, Kin'emon, Kanjuro, the Shogun of little shits aka Momonosuke, Pedro, Caesar
Totto Land: Pedro, Pekoms, Carrot, Pudding, Reiju, Jinbe
I think by around Marineford I realized this series is never going to end just by the amount of guys in there. Holy! I definitely missed some here so tell me who in the comms.