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.