After the death of Major General Ezra Shields and the nano surge, find Kyle Baxter at Cloud 9 Bar, he'll talk you to meet him at Cathedral of the Spark.
After draining the coolant liquid of floor 2 at Cathedral of the Spark, you can find a sideway of the new shortcut to Medbay, which leads to a small room with Kyle Baxter inside, wearing IRONMAUS Set and Justice of the Iron Maus gloves.
Tell him to go out. At some point, you'll find an enemy body with Iron Maus' mark aside, you'll also hear him talk about going back to the small room.
Meet him at the small room again, you can:
- Tell him to go out the second time. He'll die somewhere in Cathedral of the Spark.
- Tell him to leave Cathedral of the Spark, he'll then show up in the Iron Maus comic shop at Port Nixon, giving you his IRONMAUS armour and Justice of the Iron Maus gloves. These will go straight into your inventory and are not blueprints)
This achievement bugged on me during my first play through and despite sending Kyle home, he never reappeared at the comic shop. I can't guarantee this works, but it did for me!, but when you send him home, immediately kill yourself (to refresh the world) and go straight back to the comic shop and he should be there.