Bitcoin has accomplished a lot over the last few years and deserves a lot of credit for it but has not achieved its goal yet. Bitcoin is set to achieve global protection whereby everyone will accept its use in terms of payment methods and apply it to their business and transactions.
It depends on how you’re seeing the goal. If you’re talking about being a peer to peer which I know is how it was defined by the developers of Bitcoin, that was achieved the moment they released and people started using it.
If you’re talking about being a global currency (which is kind of similar to what the developers had in mind as well) well, it kind of have also accomplished that too because it is now a currency that is working in so many countries and there are lots of using it. Then if you mean investment, well that was not part of the goals the developers had in mind, but Bitcoin is today considered as one of the best assets anyone can hold.