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The player should save their game while inside the final room. In this room, Eliza Cassan will present the player with three switches and a passageway to a fourth switch, each switch responding to each of the different possible endings (Taggart's Ending to restrict enhancement research, Sarif's to do the opposite, Darrow's to inform everyone about the Illuminati and the signal, or the self-destruct ending where Adam can sink the base - and kill everyone, himself included - , to prevent spinning of the story). The player can choose an ending, reload the game to this save point, and then select a different ending in succession until they have watched all four possible endings.
Alternatively, the player may choose to play through the game from start to finish four separate times to earn the achievement.