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