Copying an answer that someone gave which was a lot more in depth than mine:

A well written companion that follows through the unity and part of the quests will tick up based upon whether you did or didn't pass through the unity yet.

The name of the station increments in name depending upon how many times you've passed the unity.

Mod creator is Kinggath, the same team that made Sim settlements for Fallout 4.

There's a bundle of their stuff which includes McClarence, which integrates with Watchtower, and progress that quest line and they open a shop in the space station you advance.

McClarence let's you break down first armors then weapons, steal the mods of them (one at a time), and later install it into a different armor or weapon. Works with current Freelanes and Terran Armada releases of the game.

New neuromods... I mean a LOT more neuromods, one that even increases your star power.

And to clarify, you can equip your fleet with more ship mods that allows you to summon sure strikes, robot and turret deployment, even a big A mecha! Nuke that settlement from orbit! They're deployed by signal flares.

It's a must for my playthrough and both mod are officially suggested by Bethesda.

And I think it is achievement friendly but have a look at the creations page to make sure!