Here is the full list of all 21 Even the Ocean achievements.
Finish Act 1 in Story Mode.
Finish the game in Gauntlet Mode under 3 hours.
Finish the game in under 5 hours.
Finish Act 1 in Gauntlet Mode.
Finished Act 5
Finished Act 4
Finished Act 3.
Visit the Art Institute of Whiteforge.
Finished Act 2.
Visit the Library.
Use the Journal.
Finished Act 1.