CITADEL FINAL VISIT
After you have completed all of the main plot missions M3 (Feros), M4 (Liara), M5 (Noveria) and M6 (Virmire) you will automatically travel back to the Citadel when you next interact with the Galaxy Map.
M7.0: Race Against Time
A cutscene occurs with you speaking to the Council, then waiting on the Normandy where you will talk to your romantic interest (otherwise Shepard will be alone); be nice to them (at least at the end of the conversation) to continue the relationship. You will then be informed by Joker to meet Captain Anderson in Flux to discuss a way to release the Normandy from lockdown. Before we do so there are two remaining Citadel assignments we can do.
C17: Citadel: Our Own Worst Enemy
Fast travel to the Med Clinic in the Wards. Move forwards and enter the main area beyond the stairs and approach the crowd. Speak to Charles Saracino then choose your responses, completing the assignment.
C18: Citadel: Negotiators Request
Continue towards Flux and speak to Elias Keeler at the foot of the stairs leading into the nightclub, where he will ask you to retrieve some stimulants from Dr. Michel. If you agree, fast travel to the Med Clinic and buy either the depressant or stimulant at the bottom of Dr. Michel's supply list. Return to Keeler and either give him one of the medicines or persuade him to change his course of action, completing the quest.
If you recruited Liara as quickly as possible (M1.0 Prologue, M2.0 Expose Saren, M2.1 Garrus, M2.2 Wrex, completing M2.0 then going straight to rescue Liara in mission M4.0) and completed all of the remaining main plot missions and assignments outlined in this walkthrough thus far with her you will unlock
Note that Liara requires much more assignments to be completed compared to the other squad members, since more weight is given to main missions and you don't recruit her until several plot quests have been completed. This achievement is easier to obtain if you complete the DLC missions before reaching this point.
M7.0: Race Against Time
Enter Flux and before meeting Captain Anderson you can go to the dance floor on the immediate right of the entrance and watch Shepard's Shuffle by dancing with Doran. If you also bring your romantic interest, select them once, listen to their quip, then select them again to make them join in.
Approach the bar and speak with Anderson sitting down at the table to the left of the bartender Rita. Choose what you want Anderson to do then select "Ready".
Now is the time to complete any Citadel assignments still remaining in your journal, since they become unavailable once you leave in the Normandy.
Return to the docking bay and enter the Normandy to begin a cutscene. Before proceeding with the endgame we will now go through the DLC missions, since they (and all other assignments) become unavailable when you start M8.0: Ilos; the game does not allow free roaming around the Galaxy Map when you finish the story.
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