First blood
In Multiplayer, get your first kill.



Over and over
In Multiplayer, get 100 kills.



Moderately experienced
In Multiplayer, get 500 kills.



Yeah, I'm pretty good
In Multiplayer, get 1,000 kills.

Phoenix Party
In Multiplayer, be in a match with a developer.

Simply join a server with one of the Half-Life: Cross Product Multiplayer developers or testers in it. Easiest obtained during community game nights which happen every couple of weeks.

Just like the old days
In Multiplayer, host a LAN server.

Host a custom game with the "Local server" box ticked. (highlighted by the red box in the image below.)