Brandon Grotesque  Sugerida por CarlosZakeru 

Not a font: http://commons.wikimedia.org/wiki/File:Activision_logo.png

But, you can use Futura and modify it if you want...

Free downloadable EPS format here: http://www.brandsoftheworld.com/logo/activision

If this post is still actual, I suggest to see the logo ACTIVISION here: http://logos-vector.com/logo/vector_Activision_2876.htm

Look, the most closely that i found is Brandon Grotesque Black (except for the letter "s").