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There are 11 achievements for the Xbox 360 version of Half-Life 2: Episode One, worth a total of 130 . There are also six achievements that can be obtained here or the other Half-Life games in The Orange Box. There are 13 achievements for Steam.
Episode One
Any Half-Life 2 game
These six achievements can be performed on Half-Life 2, Episode One or Episode Two and are worth 40 on The Orange Box. For Steam, only Conservationist and Think Fast! can be obtained in Episode One.