A Realm Reborn
7th Umbral Era Quests are Main Scenario Quests released in patch 2.0. They range from level 1 to 50, and ends at The Ultimate Weapon. These quests unlock various pre-50 dungeons and trials.
7th Astral Era Quests are level 50 endgame quests released in patch 2.1 - 2.55. They unlock various level 50 dungeons, trials and continue the story.
Heavensward Main Scenario Quests are level 50 - 60 quests released in the Heavensward expansion, patch 3.0+.
To access Ishgard, the new area in Heavensward, you need to complete all of the 7th Astral Era Quests up to Before the Dawn (all of the Main Scenario Quests up to patch 2.55).
Dragonsong War Quests and After are level 60 endgame quests released from 3.1 forward.
Stormblood Main Scenario Quests are level 60 - 70 quests released in the Stormblood expansion, patch 4.0+. To access Ala Mhigo and the Far East, the new areas in Stormblood, you need to complete all of the Dragonsong War Quests up to The Far Edge of Fate (all of the Main Scenario Quests up to patch 3.56). This does not apply to to the housing zone, Shirogane.
The Legend Returns Quests are level 70 endgame quests released from 4.1 forward.
Shadowbringers Main Scenario Quests are level 70 - 80 quests released in the Shadowbringers expansion, patch 5.0+. To access Norvrandt, the new areas in Shadowbringers, you need to complete all of the The Legend Returns Quests up to A Requiem for Heroes (all of the Main Scenario Quests up to patch 4.56).
List of All Main Scenario Quests
A Realm Reborn