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30 of 42 (71%) achievements earned:

Personal Achievements
 

Hit and Run

Break out of the Combine prisoner transport vehicle.
Unlocked Dec 29, 2020 @ 2:38pm

Quaranta Giorni

Enter the Quarantine Zone.
Unlocked Dec 29, 2020 @ 3:27pm

Mazel Tov

Pick up and smash 50 glass bottles.
Unlocked Jan 1 @ 9:22am

Good Grub

Feed the snark.
Unlocked Dec 29, 2020 @ 2:27pm

Sustenance

Receive a tasty treat.
Unlocked Dec 30, 2020 @ 9:56am

Zombie with a Shotgun

Collect the shotgun.
Unlocked Dec 30, 2020 @ 10:11am

Xen Garden

Enter the explosive Xen infestation.
Unlocked Dec 31, 2020 @ 9:02am

Off the Rails

Stop the prisoner transport train.
Unlocked Dec 31, 2020 @ 9:45am

Checking In

Reach the Northern Star.
Unlocked Dec 31, 2020 @ 12:00pm

Heart-Breaker Hotel

Get creative turning the power back on.
Unlocked Dec 31, 2020 @ 12:50pm

Surface Tension

Escape the underground pit.
Unlocked Dec 31, 2020 @ 1:32pm

Unbonded

Collect the SMG.
Unlocked Jan 1 @ 2:45am

Cord-Cutter

Shut down the substation.
Unlocked Jan 1 @ 3:24am

Blast From the Past

Defuse a roomful of explosive barrels.
Unlocked Jan 1 @ 7:36am

Flat Note

Kill Jeff.
Unlocked Jan 1 @ 9:30am

Hold Your Liquor

Catch a bottle falling out of a cupboard before it breaks and alerts Jeff.
Unlocked Jan 1 @ 9:21am

Sea Level

Reach the aquatic exhibits.
Unlocked Jan 1 @ 10:50am

Triple Bypass

Solve the tanker yard's electrical puzzle and escape.
Unlocked Jan 1 @ 12:32pm

High Water March

Start climbing the water tower.
Unlocked Jan 1 @ 12:56pm

Textbook Jinxing

Wake the Strider.
Unlocked Jan 1 @ 1:15pm

Point Extraction

Get to the superweapon.
Unlocked Jan 1 @ 2:34pm

Consequences

Make your choice.
Unlocked Jan 1 @ 2:37pm

Dead Giveaway

Loot a corpse.
Unlocked Dec 29, 2020 @ 2:54pm

Smash and Grab

Break open a supply crate with your hands.
Unlocked Dec 30, 2020 @ 8:30am

Up in Arms

Install your first pistol upgrade.
Unlocked Dec 30, 2020 @ 8:50am

Pro-Pain

Kill a grunt by shooting their gas tank.
Unlocked Dec 31, 2020 @ 9:23am

Xen Lootism

Snatch a Xen grenade from its resting place.
Unlocked Dec 31, 2020 @ 12:31pm

Safe Trip

Use the multitool to hack a tripmine.
Unlocked Jan 1 @ 7:29am

Near-Jeff Experience

Stay close to Jeff for 10 seconds (but not too close).
Unlocked Jan 1 @ 8:11am

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 Dec 29, 2020 @ 2:18pm



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.

Combine Harvester

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

Deadliest Catch

Use the gravity gloves to intercept an incoming enemy grenade in mid-flight.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked