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