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