Here's the Spotify playlist: Sergei Rachmaninoff: Complete Works (277 tracks, 1.1 days). It consists of the op. 1-45, sorted by opus numbers. And some interesting works without opus numbers, like the lovely string quartets and the only survived movement of his "Youth" symphony. This is the wiki page for the list of compositions.
Rachmaninoff is also one of the greatest pianists of the last century, check out Rachmaninoff Plays Rachmaninoff (Spotify link) for his interpretations of his own works.