Here is the full list of all 42 Ghost Song achievements.
Heal yourself many times.
Defeat Dolly.
Help to repair Gambler.
Defeat Henriette...
Defeat many enemies.
Defeat Kika.
Arrive at the crash site.
Help to repair Gambler again.
Bring a third part to Gambler.
Continue to assist in the repair of Gambler.
Once again, help to repair Gambler.
Fully repair Gambler.
Defeat a Big Bot.
Help your friends escape.
Defeat Henriette again.
Defeat Elsom.
Defeat Old Singer.
Defeat Kellunhelk.
Defeat Vek.
Obtain many modules.
Obtain many weapons.
Locate many Big Bots.
Obtain many Healing Cores.
Visit The Cut Machine.
Spend time with Pasha.
Find Charley.
Get to know Saymund.
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.
Reach level 30.
Show off with flowers.
Push the large piece of junk down the hill.
Finish the game in under 3 hours.