Half-Life 2 achievements

Get the crowbar.

Escape the apartment block raid.

Find and break every web cache in Episode Two.

Kill five enemies with the same energy ball.

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!

Escape City 17 with Alyx.

Don't let any citizens die when escorting them to the escape train.

Steal a Zombine's grenade.

Defeat the chopper in Episode Two without any misses.

Squish every antlion grub in Episode Two.

Save all buildings outside the missile silo from destruction.

Kill a Combine soldier with his own grenade.