Here is the full list of all 20 Nystagmus achievements.
Collect all 60 notes
Complete game and leave the island
Find the Vtopia Game
Find a copy of Jacob Hayes Was Gone Today
Find the Soul Flask
Find the Fish Toy
Have a near death experience
Write diary at every campfire
Complete the game with bad ending
Find the Driver License
Kill yourself in a dumb way
Find a upside down cross
Find the inkwell
Find the necklace
Find the other half of the picture
Find the wedding ring
Get closer to the monster
Find the music box
Find the storybook
Make the right decision