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32 of 42 (76%) achievements earned:
Personal Achievements
 

Hit and Run

Break out of the Combine prisoner transport vehicle.
Unlocked 27 Jan @ 9:49pm

Quaranta Giorni

Enter the Quarantine Zone.
Unlocked 27 Jan @ 10:25pm

Mazel Tov

Pick up and smash 50 glass bottles.
Unlocked 31 Jan @ 9:12pm

Good Grub

Feed the snark.
Unlocked 31 Jan @ 9:03pm

Little Slugger

Represent yourself with a specific prop on Russell's map.
Unlocked 31 Jan @ 9:22pm

Mag-Snagger

Catch Russell's ammo magazine before it hits the ground.
Unlocked 31 Jan @ 9:29pm

Sustenance

Receive a tasty treat.
Unlocked 27 Jan @ 11:17pm

Zombie with a Shotgun

Collect the shotgun.
Unlocked 27 Jan @ 11:25pm

Xen Garden

Enter the explosive Xen infestation.
Unlocked 29 Jan @ 3:18am

Off the Rails

Stop the prisoner transport train.
Unlocked 29 Jan @ 3:48am

Checking In

Reach the Northern Star.
Unlocked 29 Jan @ 4:41am

Heart-Breaker Hotel

Get creative turning the power back on.
Unlocked 29 Jan @ 5:15am

Surface Tension

Escape the underground pit.
Unlocked 29 Jan @ 5:35am

Unbonded

Collect the SMG.
Unlocked 29 Jan @ 6:11am

Cord-Cutter

Shut down the substation.
Unlocked 29 Jan @ 8:14pm

Blast From the Past

Defuse a roomful of explosive barrels.
Unlocked 30 Jan @ 6:26am

Flat Note

Kill Jeff.
Unlocked 30 Jan @ 11:01pm

Hold Your Liquor

Catch a bottle falling out of a cupboard before it breaks and alerts Jeff.
Unlocked 30 Jan @ 10:52pm

Sea Level

Reach the aquatic exhibits.
Unlocked 30 Jan @ 11:32pm

Triple Bypass

Solve the tanker yard's electrical puzzle and escape.
Unlocked 31 Jan @ 12:51am

High Water March

Start climbing the water tower.
Unlocked 31 Jan @ 1:35am

Point Extraction

Get to the superweapon.
Unlocked 31 Jan @ 2:21am

Consequences

Make your choice.
Unlocked 31 Jan @ 2:25am

Dead Giveaway

Loot a corpse.
Unlocked 27 Jan @ 10:01pm

Smash and Grab

Break open a supply crate with your hands.
Unlocked 27 Jan @ 10:44pm

Up in Arms

Install your first pistol upgrade.
Unlocked 27 Jan @ 10:38pm

Pro-Pain

Kill a grunt by shooting their gas tank.
Unlocked 29 Jan @ 8:16pm

Combine Harvester

Use the gravity gloves to loot an item off a living Combine soldier.
Unlocked 31 Jan @ 2:15am

Xen Lootism

Snatch a Xen grenade from its resting place.
Unlocked 29 Jan @ 5:07am

Safe Trip

Use the multitool to hack a tripmine.
Unlocked 30 Jan @ 5:19am

Near-Jeff Experience

Stay close to Jeff for 10 seconds (but not too close).
Unlocked 30 Jan @ 10:11pm

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 27 Jan @ 9:30pm



On a Roll

Interact with the playground somehow.

Freshly Squeezed

Test your grip on a headcrab heart.

Indirect Approach

Kill a Combine Heavy while their shield is up.

Deadliest Catch

Use the gravity gloves to intercept an incoming enemy grenade in mid-flight.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked