Achievements unlock in 2021.

If you have this game, it is still possible to unlock achievements in this game, but you must play it in the offline mode.

I put my Microsoft Lumia 950 XL in the airplane mode and then played the game normally, until I unlocked some achievement. Then, quit the game, back online and launched Real Racing 2 (but, I guess it can be any else game). Then stayed in the main menu for about 5 minutes.

I used Xbox One SmartGlass application to see unlocked achievement in this game.

Does the game not work while online at all? Would mean the 2 MP achievements are discontinued.
Let me know if that's the case, I'll submit the appropriate flags.

It works online. But you can easily lose all you progress... And more easily get your game not load at all.

Offline is the best method for most achievements.