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How can I gain access to all Steam features?
To access all features of Steam, simply do any of the following on your Steam account: purchase a game from the Steam store (It cannot be a gift for another account), redeem a Steam gift, or complete a microtransaction.

Can I gain access to these features by activating a retail game on Steam, playing free demos, adding a non-Steam game as a shortcut, or promotional trials like Free Weekends?
No. Demos, Free Weekends, free games (Examples: Alien Swarm, free versions of Portal or Team Fortress 2), other promotions do not act as qualifying items.