So in this one I'll be listing all the dreams and ambitions for the crew and certain other characters who's dreams are known.
Luffy: Getting the One Piece and become Pirate King which will be accomplished when they reach.
Nami: Make a map the entire world which I don't think will be accomplished completely by the end of story considering she has to map the North, South and West Blue and unless she went to the different blues when she worked for Arlong, she obviously has a lot more to do from what we know.
Usopp: Become a brave warrior of the sea and learn from the Giant warrior of Elbaf. This will be accomplished by the Elbaf,
Zoro: Become the strongest swordsman. I honestly have no clue when this will be the accomplished. It could be at Wano, it could be the very end after they find the One Piece.
Sanji: Play with the mermaids and find the All Blue. There's the theory that there'll be a weapon at Raftel that'll destroy the Red Line and all the blues will converge. But that's just a popular theory.
Chopper: Be able to cure all diseases. There's the theory on Luffy getting sick with Roger's disease and Chopper curing it and stuff so whenever that happens.
Robin: Find out the full history of the world. Whenever she reads the last poneglyph which should be at Raftel.
Franky: Build a ship that will go across the Grand Line. This dream is pretty much done if the Sunny never gets destroyed like the Merry... RIP sweet princess.... but there's the possibility something happens to it.
Brook: Deliver his crew's last song to Laboon. You know something? I wonder if he ever asked the Longarm Tribe to bring him over there or whatever. Most likely he's just waiting for Luffy and co to go to the end of the New World and using the Reverse Mountain to go meet him but this feels like something that could've been done.
Pretty much all pirate captains: Become Pirate King
Coby: Become an Admiral and be as string as Luffy.
Crocodile: Find/recreate Pluton and kill Whitebeard.