Here is the full list of all 42 Ghost Song achievements.
Complete the game without dying.
Finish the game in under 3 hours.
Get to know the crew.
Get to know Saymund.
Spend time with Pasha.
Help your friends escape.
Complete the game on Original difficulty.
Defeat a Big Bot.
Destroy many innocent creatures.
Do a killer Painwheel juggle.
Obtain many modules.
Obtain many weapons.
Find Charley.
Say goodbye to Mutt.
Defeat Kellunhelk.
Show off with flowers.
Help Gili.
Visit The Cut Machine.
Obtain many Healing Cores.
Push the large piece of junk down the hill.
Have a chat with Relic.
Destroy many Roslock creatures in the pit.
Locate many Big Bots.
Receive a special gift from Molly.
Once again, help to repair Gambler.
Fully repair Gambler.
Defeat Vek.
Reach level 30.
Continue to assist in the repair of Gambler.
Defeat Henriette again.
Bring a third part to Gambler.
Defeat Old Singer.
Reach Mabec.
Heal yourself many times.
Help to repair Gambler again.
Defeat Elsom.
Defeat many enemies.
Help to repair Gambler.
Defeat Henriette...
Defeat Kika.
Defeat Dolly.
Arrive at the crash site.