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42 of 42 (100%) achievements earned:
Personal Achievements
 

Hit and Run

Break out of the Combine prisoner transport vehicle.
Unlocked May 13, 2021 @ 8:57am

Quaranta Giorni

Enter the Quarantine Zone.
Unlocked May 13, 2021 @ 9:40am

Mazel Tov

Pick up and smash 50 glass bottles.
Unlocked May 13, 2021 @ 12:50pm

Good Grub

Feed the snark.
Unlocked May 13, 2021 @ 8:42am

On a Roll

Interact with the playground somehow.
Unlocked Nov 5, 2022 @ 10:31am

Little Slugger

Represent yourself with a specific prop on Russell's map.
Unlocked May 24, 2021 @ 3:07am

Eye of the Geiger

Measure Russell with the Geiger counter.
Unlocked May 24, 2021 @ 3:07am

Mag-Snagger

Catch Russell's ammo magazine before it hits the ground.
Unlocked May 24, 2021 @ 3:10am

Sustenance

Receive a tasty treat.
Unlocked May 13, 2021 @ 12:01pm

Freshly Squeezed

Test your grip on a headcrab heart.
Unlocked May 13, 2021 @ 11:57am

Zombie with a Shotgun

Collect the shotgun.
Unlocked May 13, 2021 @ 12:12pm

Xen Garden

Enter the explosive Xen infestation.
Unlocked May 13, 2021 @ 1:28pm

Off the Rails

Stop the prisoner transport train.
Unlocked May 13, 2021 @ 1:49pm

Checking In

Reach the Northern Star.
Unlocked May 14, 2021 @ 9:51am

Heart-Breaker Hotel

Get creative turning the power back on.
Unlocked May 14, 2021 @ 10:21am

Surface Tension

Escape the underground pit.
Unlocked May 16, 2021 @ 4:25am

Unbonded

Collect the SMG.
Unlocked May 16, 2021 @ 5:03am

Cord-Cutter

Shut down the substation.
Unlocked May 16, 2021 @ 5:39am

Blast From the Past

Defuse a roomful of explosive barrels.
Unlocked May 16, 2021 @ 9:07am

Sound Strategy

Escape the distillery without killing Jeff.
Unlocked May 16, 2021 @ 11:14am

Flat Note

Kill Jeff.
Unlocked Nov 20, 2022 @ 3:34pm

Crustacean Frustration

Kill the annoying headcrab before it breaks everything.
Unlocked Nov 20, 2022 @ 3:21pm

Hold Your Liquor

Catch a bottle falling out of a cupboard before it breaks and alerts Jeff.
Unlocked May 16, 2021 @ 11:09am

Sea Level

Reach the aquatic exhibits.
Unlocked May 16, 2021 @ 11:37am

Triple Bypass

Solve the tanker yard's electrical puzzle and escape.
Unlocked May 16, 2021 @ 12:47pm

High Water March

Start climbing the water tower.
Unlocked May 16, 2021 @ 1:15pm

Textbook Jinxing

Wake the Strider.
Unlocked May 16, 2021 @ 1:36pm

Point Extraction

Get to the superweapon.
Unlocked May 16, 2021 @ 2:10pm

Consequences

Make your choice.
Unlocked May 16, 2021 @ 2:14pm

Dead Giveaway

Loot a corpse.
Unlocked May 13, 2021 @ 9:13am

Smash and Grab

Break open a supply crate with your hands.
Unlocked May 13, 2021 @ 9:47am

Up in Arms

Install your first pistol upgrade.
Unlocked May 13, 2021 @ 9:56am

Pro-Pain

Kill a grunt by shooting their gas tank.
Unlocked May 13, 2021 @ 1:32pm

Indirect Approach

Kill a Combine Heavy while their shield is up.
Unlocked Nov 20, 2022 @ 7:26am

Combine Harvester

Use the gravity gloves to loot an item off a living Combine soldier.
Unlocked May 16, 2021 @ 2:04pm

Xen Lootism

Snatch a Xen grenade from its resting place.
Unlocked May 14, 2021 @ 10:13am

Safe Trip

Use the multitool to hack a tripmine.
Unlocked May 16, 2021 @ 5:53am

Deadliest Catch

Use the gravity gloves to intercept an incoming enemy grenade in mid-flight.
Unlocked May 16, 2021 @ 1:06pm

Near-Jeff Experience

Stay close to Jeff for 10 seconds (but not too close).
Unlocked May 16, 2021 @ 10:33am

Team Spirit

Bring Russell a bottle of vodka.
Unlocked Nov 20, 2022 @ 3:38pm

Gnome Vault of My Own

Bring a garden gnome with you to the Vault.
Unlocked Nov 20, 2022 @ 5:46pm

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 May 13, 2021 @ 7:33am