Achievements

This is a complete listing of all achievements available in Portal, Portal: Still Alive and Portal 2.

Achievements are sets of challenges or goals (from finding a secret room to finishing a test chamber in a certain time or with a limited number of portals) that give a acknowledgement to the player for this special action while playing the game. When a player obtains an achievement, a HUD notification will be shown on-screen.

Achievements can be completed at any time in the game. However, certain achievements are story-related and can only be unlocked when reaching a certain point in the scenario.

Trivia

 * The "Transmission Received" achievement for Portal was added on March 1, 2010, and began the Portal ARG, eventually leading to the announcement of Portal 2. The update on March 1 also added 26 hidden clock radios to Portal test chambers that delivered coded messages, further hinting toward the announcement.
 * The "Talent Show" achievement for Portal 2 was added on July 7, 2011, The probably cause of that is, the game will participate in the Steam Summer Camp, and with obtaining the achievement you will be able to get a ticket.