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