Here is the full list of all 42 Ghost Song achievements.
Say goodbye to Mutt.
Help your friends escape.
Complete the game on Original difficulty.
Defeat a Big Bot.
Receive a special gift from Molly.
Once again, help to repair Gambler.
Fully repair Gambler.
Defeat Henriette again.
Reach Mabec.
Locate many Big Bots.
Defeat Elsom.
Have a chat with Relic.
Continue to assist in the repair of Gambler.
Bring a third part to Gambler.
Defeat Vek.
Help to repair Gambler again.
Reach level 30.
Defeat Dolly.
Heal yourself many times.
Help to repair Gambler.
Defeat Henriette...
Defeat many enemies.
Defeat Kika.
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.
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.