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