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