If at First You Don't Succeed, You Have Failed
Lose your first single-player mission.
Breaking the 4th Wall
Blow up the 4th wall in a level with a rocket launcher.
Master of Clicking on Stuff
Finish the tutorial.
True Focus Means Ignoring That Which is Irrelevant
Ignore an enemy.
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
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Portal 2
Preservation of Mass
Break the rules in Test Chamber 07
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Portal 2
Wake Up Call
Survive the manual override
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Portal 2
You Monster
Reunite with GLaDOS
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Portal 2
Undiscouraged
Complete the first Thermal Discouragement Beam test
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Portal 2
Bridge Over Troubling Water
Complete the first Hard Light Bridge test
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Portal 2
Stalemate Associate
Press the button!
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Portal 2
Tater Tote
Carry science forward
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Portal 2
Vertically Unchallenged
Master the Repulsion Gel
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Portal 2
Stranger Than Friction
Master the Propulsion Gel
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Portal 2
Tunnel of Funnel
Master the Excursion Funnel
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Portal 2
Dual Pit Experiment
Do the same test twice
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Portal 2
The Part Where He Kills You
This is that part
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Portal 2
