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.
Visit The Cut Machine.
Push the large piece of junk down the hill.
Find Charley.
Get to know the crew.
Receive a special gift from Molly.
Once again, help to repair Gambler.
Fully repair Gambler.
Help Gili.
Locate many Big Bots.
Destroy many Roslock creatures in the pit.
Have a chat with Relic.
Show off with flowers.
Do a killer Painwheel juggle.
Get to know Saymund.
Obtain many weapons.
Reach Mabec.
Reach level 30.
Defeat Henriette again.
Say goodbye to Mutt.
Continue to assist in the repair of Gambler.
Defeat Vek.
Spend time with Pasha.
Bring a third part to Gambler.
Destroy many innocent creatures.
Defeat Dolly.
Defeat Old Singer.
Heal yourself many times.
Obtain many Healing Cores.
Help to repair Gambler again.
Help to repair Gambler.
Defeat many enemies.
Defeat Elsom.
Defeat Kellunhelk.
Defeat Henriette...
Defeat Kika.
Arrive at the crash site.