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