Oh yeah - who cares about dooming earth, bringing oppressive, militaristic force to this dimension/planet and eradicating Earths’ flora and fauna, you blew up MY CASSEROLE!
I feel like this would be a very fun and easy to implement achievement. It’s definitely doable, I’ve done it in half life just for fun:
Here, lemme buy you a drink - Destroy every single vending machine in Black Mesa.
I also like the achievement mentioned by Jack Freeman
Don’t talk smack about me! - Destroy every single radio in the game
Unstopable sciense: Wall-gauss 15 enemies with TAU cannon
I wouldn’t put it past Magnusson. 
CrowBar Hero: bash every headcrab on the elevator down with the crowbar. (don’t let any drown in the pool below)
Crab is under a Tack: Pin a headcrab to a wall with the crossbow as it jumps.
Twitter Shitter: Find out what that scientist was doing in that stall for so long. [Open the bathroom stall after the resonance cascade to find a laptop on the toilet]
Clever Girl…: kill an assassin with the shotgun
Mmmmm Donuts…: Eat the donuts on the table in the lunchroom.
Power Armor Isn’t for Pussies: Smack the Duke Nukem figure off the workstation
Waste Not, Want Not: Access every suit charger and health station in the Black Mesa facility.
That MIT education Really paid off!: Jump from the station platform in the sector C Test labs.
i actually really like that one. especially because if you miss one. oh that hurts so bad.
You can do better with Black Mesa!
Here are the criteria for some achievements to add:
- Swing a crowbar
- Hurt a headcrab
- Kill a headcrab
- Hurt a headcrab while it’s in the air
- Kill a headcrab while it’s in the air
- Hit anything with a crowbar
- Kill anything with a crowbar
- Hit a monster with a crowbar
- Kill a monster with a crowbar
- Hit a headcrab with a crowbar
- Kill a headcrab with a crowbar
- Hit a headcrab with a crowbar while it’s in the air
- Kill a headcrab with a crowbar while it’s in the air
- Kill anything without taking damage
- Kill a monster without taking damage
- Kill a headcrab without taking damage
- Kill anything while standing
- Kill a monster while standing
- Kill a headcrab while standing
- Kill anything within 1m
- Kill a monster within 1m
- Kill a headcrab within 1m
…
May I use satchel charges or the gauss gun
If you feel like satchelling things 1m away from you, by all means go for it.
Om Nom Nom: Use the Microwave
Gabe, Gabe, Gabe Newell: Find the pictures of Gabe Newell (easter egg)
boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom boom. - create a chain explosion of 25 trip mines.
I feel bad for laughing, but considering he was pointing a high explosive at a building wall less than twenty feet away he kinda deserved it.
Ever heard of Darwins’ award?
Yes, and that guy should win one.
I used to be a scientist like you… : Shoot the knee of a security guard with a crossbow to trigger a special dialog
Rage Quit! - Hit Alt + F4 to close the game within 5 seconds of dying
Head Kababacrab - Skew 3 headcrabs with one cross bow bolt.
“Welcome to Costco. I love you”
Empty out all security rooms of ammunition, weapons, and health.
Crate Hate: Destroy every destructible crate in the game.