Here is the full list of all 16 Psikodelya achievements.
See all pictures.
This is the end, beautiful friend.
Open all portals.
Visit the Neon Box.
Enter the maze.
Tried to swim in lava.
Visit the purple swamp.
Die falling into the void.
Die in a trap.
Collect an acid.
See a picture.
Read a note.
Visit a new dimension.
Collect all acids.
Read all notes.
And the truth shall make you mad. 100% complete!