1. Portal Achievements
  2. Rocket Science achievement
Portal

Portal

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8-10h
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Rocket Science achievement in Portal

Rocket Science

Earn silver medals on all Portal challenges.

Rocket Science0
Offline Mode - These achievements require play in game modes that do not necessitate a connection to any online services.Single Player - These achievements can be obtained by a single player.Time/Date - These achievements require you to play the game or perform actions at certain times, within a time limit, or on specific dates.

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