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

Hit and Run

Break out of the Combine prisoner transport vehicle.
Unlocked 16 Aug @ 7:50pm

Quaranta Giorni

Enter the Quarantine Zone.
Unlocked 20 Aug @ 3:49pm

Mazel Tov

Pick up and smash 50 glass bottles.
Unlocked 1 Sep @ 10:07am

Good Grub

Feed the snark.
Unlocked 16 Aug @ 7:37pm

Sustenance

Receive a tasty treat.
Unlocked 1 Sep @ 10:15am

Zombie with a Shotgun

Collect the shotgun.
Unlocked 1 Sep @ 12:14pm

Xen Garden

Enter the explosive Xen infestation.
Unlocked 12 Oct @ 6:56am

Dead Giveaway

Loot a corpse.
Unlocked 18 Aug @ 3:48pm

Smash and Grab

Break open a supply crate with your hands.
Unlocked 24 Aug @ 6:54am

Up in Arms

Install your first pistol upgrade.
Unlocked 20 Aug @ 4:02pm

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 16 Aug @ 7:23pm



On a Roll

Interact with the playground somehow.

Freshly Squeezed

Test your grip on a headcrab heart.

Unbonded

Collect the SMG.

Pro-Pain

Kill a grunt by shooting their gas tank.

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.
+22

22 hidden achievements remaining

Details for each achievement will be revealed once unlocked