Hello,
If you have everything on your 360 as of now, you will only have to purchase the base game and TTK.
TDB and HoW will transfer due to the Digital Upgrade Program, but TTK will not because it was excluded.
The best thing you can do is probably find a [u]Black Friday[/u] deal at [b]GameStop[/b] for the legendary edition; I think it's $[u]20[/u] off, so it's a steal.
English
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So I've beaten the ttk story, when I buy it again, will I have to do the story again or will I be able to pick up where I left off?
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You will be able to pick up wherever you left off. Guardians are linked to your XBL or PSN profile.