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