Here is the full list of all 20 Immersive Poetry achievements.
Collect all Poem Parchments
Enter the Gate with no Gate
Investigate the Blue Object
Find the Music Box
Collect 5 Groups of Mushrooms
Find your Wife's Glasses
Enter the Correct Code
See the Submarine
Complete the Third Level
Collect 5 Poem Parchments
Collect 3 Poem Parchments
Reset your Progress
Leave your Journal Behind
Complete the Sixth Level
Complete the Fifth Level
Complete the Fourth Level
Take a Photo with the In-Game Photo Mode
Complete the Second Level
Complete the First level