Here is the full list of all 42 Ghost Song achievements.
Defeat Kika.
Reach Mabec.
Help to repair Gambler.
Defeat Vek.
Defeat many enemies.
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 Dolly.
Defeat Henriette...
Defeat Henriette again.
Defeat Elsom.
Defeat Old Singer.
Defeat Kellunhelk.
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.
Heal yourself many times.
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.