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