| Achievement | How to unlock
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- Defense of the Armament ( 20 points )
| - Save the missile silo from the Combine offensive.
|
- Defiant Achievement ( 5 points )
| - At the beginning of Half-Life 2 where the carbine cop asks you to pick up the can, pick it up and hit him with it.
|
| - Destroy the Combine cannon in the junkyard.
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- Hallowed Ground ( 5 points )
| - Escort Gregori safely through the church cemetery in Half-Life 2.
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- Meet the Hunters ( 10 points )
| - Survive the Hunter ambush with Alyx.
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- Quiet Mountain Getaway ( 10 points )
| - Survive the ambush at White Forest Inn.
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- Secondary Silo Secured ( 5 points )
| - Secure the launch doors on missile silo 2.
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- Singularity Collapse ( 25 points )
| - Destroy the Citadel's reactor core in Half-Life 2.
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| - Put the can in the trash in Half-Life 2.
|
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| - Defeat both antlion guards outside the White Forest.
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- Where Cubbage Fears to Tread ( 5 points )
| - Defend Little Odessa from the gunship attack in Half-Life 2.
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