Achievements:
Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.
A bigger, better, scalier rat: Kill the Samurai that's wrecking the maintenance power conduits.
Big spaceship lights: Enable power in the Process Control level.
Boomsticked: Collect the Shotgun.
Dance little flames, dance: Spread fire to 5 enemies in under 20 seconds.
Ensign Crawlerbane: Kill 50 crawlers, of any description.
Ensign Livingstone, I presume: Kill an Exploder, a Baby Crawler, a Crawler, a Big Cousin, a Seeker and a Samurai.
Firestarter, twisted firestarter: Collect the fire ammo blueprint.
First Ooze: Kill your first Scavenger enemy.
Get off my ship!: Kill the Scavenger Queen.
Good girl: Complete the training level all the way through to the exit portal.
It's time for science!: Reach the laboratories hub.
Mad engineer: Collect the full set of F. Magnusson logs.
My little friend says hello: Collect the Assault Rifle.
Semper fodder: Collect the full set of B. Kowicz logs.
Skipping School: Skip the training level by exiting through the very first portal.
The bunny o' war: Collect the Grenade Launcher.
Unfortunate survivor: Collect the full set of N. Fortunate logs.