Escaped the Imperial Sewers, Main Quest Beginning
Oblivion Main Quest
The Elder Scrolls IV: Oblivion Remastered
From escaping the imperial sewers to completing the game, these are the milestones of finishing the main quest line.
Achievements
Closed an Oblivion Gate, Main Quest
Located the Shrine of Dagon, Main Quest
Delivered Daedric Artifact, Main Quest
Destroyed the Great Gate, Main Quest
Completed the Main Questline