Here is the full list of all 45 Hypnagogia 無限の夢 Boundless Dreams achievements.
Complete the secret Hell World dream.
Enter the portal in nowhere.
Obtain the first dream shard.
Obtain the second dream shard.
Obtain the third dream shard.
Obtain the fourth dream shard.
Obtain the fifth dream shard.
Obtain the sixth dream shard.
Obtain the seventh dream shard.
Meet The Dream Catcher and face your true self.
Obtain the final dream shard.
Complete Hypnagogia: Boundless Dreams.
Complete the secret Desert World dream.
Complete the secret School World dream.
Complete the secret Candy World dream.
Complete Gogi's dream.
Clip out of reality.
Gather Hypno's details on the situation.
Charm the Weird Door in Mushroom World.
Find the hidden Vineshroom tribute.
Find the secret arcade in Mall World.
Find the secret fanart gallery in Mist World.
Find the secret fanart gallery in Desert World.
Find the secret fanart gallery in Haunted World.
Find the secret fanart gallery in Mall World.
Pet the dog in Ice World.
Press the Shapezoid's mysterious red button.
Ride the Strider before leaving Desert World.
Find and hug all 6 shivering settlers in Ice World.
Listen to all of Advisor Mung's bad jokes.
Get the jump on Gardener Freckle.
Find the secret fanart gallery in School World.
Find the hidden meat.
Find the secret fanart graffiti in Tower World.
Get denied by the Weird Door in Mushroom World.
Read all 5 chapters of The Rapture of Grimthorn.
Complete the secret Underwater World dream.
Unlock the Level Select mode by beating the game once.
Find the secret game model gallery.
Help the hidden Snow Child reassemble Mr. Snowman.
Deliver the Prismatic Ring.
Escape Forest World alone.
Obtain the optional dungeon map.
Obtain the hidden Duck Bomb upgrade.
Find the secret fanart gallery in Forest World.