| Achievement | How to unlock |
| Defense of the Armament (20 points) | Save the missile silo from the Combine offensive.
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| 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.
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| Gunishment! (5 points) | 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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| Submissive (5 points) | Put the can in the trash in Half-Life 2.
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| Twofer (5 points) | 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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