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