Obtaining Portal achievements
From the Portal Wiki
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Lab Rat Acquire the fully powered Aperture Science Handheld Portal Device. Difficulty: Very Easy How to obtain: This achievement is story related, it is earned once you equip the Dual Handheld Portal Device in Test Chamber 11. |
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Fratricide Do whatever it takes to survive. Difficulty: Very Easy How to obtain: This achievement is story related, it is earned once you burn the Weighted Companion Cube in Test Chamber 17. |
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Partygoer Make the correct party escort submission position decision. Difficulty: Very Easy How to obtain: This achievement is story related, it is earned once you escape from the burning pit and carry onto the escape levels after The Final Test. |
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Heartbreaker Complete Portal. Difficulty: Very Easy How to obtain: This achievement is story related, it is earned once you defeat GLaDOS and beat the game. |
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Friendly Fire Knock down a turret with another turret. Difficulty: Easy How to obtain: To earn this achievement, You must pick up a Turret and knock over another one. |