Unity Scripts edited in Visual studio don't provide autocomplete

Question

When I want to edit C# Unity scripts, they open in Visual Studio. It is supposed to provide auto complete for all Unity related code, but it doesn\'t work.

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Answer 1

Update 2020 with Visual Studio Community 2019 and Unity 2019.3:

1. Open Visual Studio Installer as Administrator, select to modify your current installation and add "Game development for Unity"

2. If you add a new c# script in Unity now, and open it (automatically) with Visual Studio, it is not described as "Miscellaneous" at the top of the window but with "Assembly-CSharp", and the autocomplete works.