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 actions while playing the game. When a player obtains an achievement, a little black window on PC or the usual green message on Xbox will appear on the screen to inform him of the achievement he just obtained.

All achievements can be completed at any time in the game, eventhough certain achievement are story related and can only be unlock 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.