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11 of 42 (26%) achievements earned:
Personal Achievements
 

Hit and Run

Break out of the Combine prisoner transport vehicle.
Unlocked 18 Dec @ 4:57am

Quaranta Giorni

Enter the Quarantine Zone.
Unlocked 18 Dec @ 5:46am

Sustenance

Receive a tasty treat.
Unlocked 21 Dec @ 6:49am

Zombie with a Shotgun

Collect the shotgun.
Unlocked 21 Dec @ 6:57am

Xen Garden

Enter the explosive Xen infestation.
Unlocked 25 Dec @ 8:01am

Off the Rails

Stop the prisoner transport train.
Unlocked 25 Dec @ 8:42am

Dead Giveaway

Loot a corpse.
Unlocked 18 Dec @ 5:12am

Smash and Grab

Break open a supply crate with your hands.
Unlocked 18 Dec @ 6:06am

Up in Arms

Install your first pistol upgrade.
Unlocked 18 Dec @ 6:19am

Pro-Pain

Kill a grunt by shooting their gas tank.
Unlocked 25 Dec @ 8:04am

Gnome Alone

If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space. If you did not also receive the achievement 'Manufacturing Ascent', Newell has abandoned his plans to shoot Noam Chomsky into space.
Unlocked 18 Dec @ 4:32am



Mazel Tov

Pick up and smash 50 glass bottles.
32 / 50

Good Grub

Feed the snark.

On a Roll

Interact with the playground somehow.

Freshly Squeezed

Test your grip on a headcrab heart.

Unbonded

Collect the SMG.

Indirect Approach

Kill a Combine Heavy while their shield is up.

Combine Harvester

Use the gravity gloves to loot an item off a living Combine soldier.

Xen Lootism

Snatch a Xen grenade from its resting place.

Safe Trip

Use the multitool to hack a tripmine.

Deadliest Catch

Use the gravity gloves to intercept an incoming enemy grenade in mid-flight.
+21

21 hidden achievements remaining

Details for each achievement will be revealed once unlocked