This is a paid asset, but now you can download After Effect Importer Free.
Detail this asset from Unity Store: Original Link
After Effect Importer v3.0 (Latest version)
This is a plugin to import animation from Adobe After Effect to your Unity project.
Unity 5 ready!
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* All move interpolation methods
* Pivot Position Change
* Additive Texture mixing
* Solid Color Layers
* Huge App Size and Ram saving
* You able to use Adobe After Effect as animation tool for 2D animation in your game
* Optimized for mobile platforms
* Open source code
* Example scenes and tutorial included
Warning: Imported animation should contain only images and compositions (which also contain only images or compositions)
Warning: After Effect language may cause some problems, it’s recommended to set After Effect to english.
Supported 3-rd party plugins:
* Playmaker – Artists and Designers: Realize your creative vision without coding! Unlock the power of Unity.