You'll get this dossier after Horizon.

Many of the enemies here have Barriers; prepare accordingly.

After speaking to Liara on Illium, you'll be directed to Dara in the transport area. Take the car here to find Samara. More dialogue follows when you arrive, but there won't be any combat until you cross the police line.

There's a small amount of combat before you meet Samara. She'll explain her current situation, which she needs help with before she can join you. Take the elevator to the Eclipse base and keep fighting until you meet Wasea. A boss battle starts here.

Once Wasea is dead, pick up her datapad and go back to the station. Tell Samara you have the information and she'll join you.

Obtained upon completing the story mission "Dossier: The Justicar".

This mission is unlocked automatically once you complete the story mission "Horizon".

This mission takes place on Illium. There are no important choices to make here, but there are multiple assignments to complete during this mission, those are completely optional but you should know that it's the only chance to do them.

In this mission you will encounter a lot of enemies with barriers which makes it a great farming spot for  Warp Specialist.

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Point of No Return: Advancing the story past the mission "Reaper IFF" may lock this trophy from being obtainable.