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