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