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