These are the decisions made in Mass Effect which are used for this story.
Relevant decisions of Mass Effect trilogy
Shepard's profile:
-Male.
-Spacer.
-War hero.
General:
-Shepard chooses all paragon decisions.
-Shepard has a romance with Liara along the trilogy, and he remains faithful to her. He has romantic relationships with nobody else.
Mass Effect 1:
-Once you can leave the Citadel, the first mission is "Find Liara T'Soni".
-All team members recruited.
-At Virmire, Wrex survives. Kaidan dies.
Mass Effect 2:
-All team members recruited, including Zaeed and Kasumi.
-Shepard doesn't trust Cerberus.
-All loyalty missions successfully completed.
-Shepard accepts reinstatement as a Spectre.
-Samara kills Morinth.
-Tali wasn't exiled.
-Grunt joins clan Urdnot.
-Maelon's research data about genophage saved.
-DLC "Lair of the Shadow Broker" completed.
-Normandy fully upgraded.
-All team members are loyal.
-The last mission before passing through the Omega 4 relay is "Legion: A house divided".
-Everyone survives the Suicide Mission, both Shepard's team and Normandy's crew. Collector base is destroyed.
Mass Effect 3:
-"Extended Cut" installed.
-All secondary missions successfully completed (Tuchanka, Rannoch…)
-DLC "From Ashes" completed.
-Liara meets Aethyta.
-Liara shows Shepard her time capsule.
-Doctor Chakwas and engineers Ken and Gabby return to the Normandy.
-Shepard encourages Joker in his relationship with EDI.
-Genophage cured.
-Shepard gives Miranda access to Alliance resources to find her sister.
-Ashley joins the team.
-All missions of Mass Effect 2 team members are successfully completed. Jack, Kasumi, Grunt, Zaeed, Samara and Jacob survive.
-Peace between quarians and geth achieved.
-DLC "Leviathan" completed.
-At Thessia, Javik goes with Shepard and Liara. Back in the Normandy, Shepard calms Liara in the argument she had with Javik.
-Miranda survives at Horizon (her sister too) and she kills her father.
-Shepard convinces Javik to use his prothean echo shard.
-DLC "Citadel" completed. Party completed.
-Shepard helps EDI understand organics.
-Minimum effective military strength: 3100.
-On Earth, Liara is part of Shepard's squad in the final push towards the Conduit.
-When speaking with the Catalyst about the possibility of controlling the reapers, the answer "I'm not losing anything" is chosen.
-Destroy ending is chosen. Shepard's team survivors: all Normandy's crew, Ashley, Garrus, James, Javik, Liara, Tali, Jack, Kasumi, Grunt, Zaeed, Samara, Jacob, Miranda and Wrex.
