Here is the full list of all 42 Ghost Song achievements.
Help your friends escape.
Defeat a Big Bot.
Get to know Saymund.
Once again, help to repair Gambler.
Fully repair Gambler.
Defeat Elsom.
Locate many Big Bots.
Defeat Henriette again.
Heal yourself many times.
Obtain many Healing Cores.
Continue to assist in the repair of Gambler.
Bring a third part to Gambler.
Defeat Vek.
Help to repair Gambler again.
Reach level 30.
Defeat many enemies.
Help to repair Gambler.
Defeat Henriette...
Defeat Kika.
Arrive at the crash site.
Defeat Dolly.
Defeat Old Singer.
Defeat Kellunhelk.
Obtain many modules.
Obtain many weapons.
Visit The Cut Machine.
Spend time with Pasha.
Find Charley.
Say goodbye to Mutt.
Get to know the crew.
Have a chat with Relic.
Help Gili.
Receive a special gift from Molly.
Reach Mabec.
Destroy many Roslock creatures in the pit.
Do a killer Painwheel juggle.
Complete the game on Original difficulty.
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.