Good luck finding a comprehensive list of anything for Empyrion, let alone RE. The game flies pretty well under most people's radar, which is sad because it is a great game. But few players means few search results for anything in Google. And since the discussions are workshop discussions we can't search back for what others have posted like on regular discussion.

I am subbing to this discussion hoping someone else knows a good source (not just for this, but for all things RE.)

From the comments section of the RE workshop page, from less than a week ago.

You can get the Strategos Class by defeating the Sector Command.
You can get the Courier Class by handing in iirc 25 undelivered cargo.
You can get and level up the Hacker Class by successfully hacking multiples of 20 satellites around stars.

Strategos gives a damage bonus to gatling guns and minigun turrets on ships.
Courier increases rep and money from handing in cargo.
Hacker increases capture rate and doubles rewards from datavaults while hacking.
Once you meet the threshold you have to unlock the class in the Class Selection window under "Special Classes".

Unfortunatly finding anything inside workshop specific discussions is a task and a half on itself at times, it would be lovely if steam could change that at some point. That being said thank you for taking the time to answer my question Vermillion. Much appreciated.

Looks like I have some more things to do now for the classes, especially since I have not even come across a sector command yet. And by the sound of the name, I may want to come well prepared for that first.

Stupid side question perhaps since you did mention the satelites specifically, but I assume the com station POI style hacks don't apply to the Hacker Class in that case?

It applies only to the hacking minigame performed where you have to hack data nodes inside a pop-up dialog box. These are usually found around stars, but can also be found in some com station/center/tower POIs as well.
If it's one where you get data chips for UCH Research: That does not count.

I didn't quite figure it was worth opening a new topic about this and my post here wasn't that old yet, but I was wondering if there is a setting I am missing something crucial.

I ended up spending a few hours downtime while waiting for friends to come online in our dedicated server to hack satelites in various systems and I've done around 47 so far that are completed now. On top of that my undelivered cargo hand-ins number over 30 for both me and a friend of mine and in both our cases special classes when selected shows nothing unlockable.

I kind of went into single player afterwards to test and handed in a total of 100 undelivered cargo for the trader faction and even then nothing popped up in the special class selection inside the class system..

So that now has me wondering, is there a setting I could have messed up or missed somewhere Vermillion? Because the rest of the class system works perfectly fine and most of the players on our server already have lvl 5 classes and subclasses (myself included) so that work fine.

Special classes aren't working now.
Will wait for hotfix.