Here is the full list of all 42 Ghost Song achievements.
Find Charley.
Help your friends escape.
Defeat a Big Bot.
Receive a special gift from Molly.
Once again, help to repair Gambler.
Fully repair Gambler.
Have a chat with Relic.
Continue to assist in the repair of Gambler.
Defeat Henriette again.
Bring a third part to Gambler.
Help to repair Gambler again.
Defeat Dolly.
Defeat Henriette...
Defeat Elsom.
Defeat many enemies.
Defeat Kika.
Reach level 30.
Help to repair Gambler.
Defeat Vek.
Arrive at the crash site.
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.
Get to know Saymund.
Say goodbye to Mutt.
Get to know the crew.
Help Gili.
Reach Mabec.
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.
Show off with flowers.
Push the large piece of junk down the hill.
Finish the game in under 3 hours.