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