1. Portal with RTX
  2. Fratricide
  3. Guide by PortalFan9001

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Portal with RTX

Portal with RTX

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Portal with RTX
Fratricide

Do whatever it takes to survive.

Fratricide0
1 guideOffline 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.Main Storyline - These achievements are gained automatically by progressing through the main game mode.
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Once you finish chamber 17, you will have to incinerate your companion cube. Once you drop the cube in the incinerator, the achievement should pop.