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.
Defeat Henriette again.
Say goodbye to Mutt.
Defeat Elsom.
Continue to assist in the repair of Gambler.
Defeat Vek.
Bring a third part to Gambler.
Help to repair Gambler again.
Defeat Dolly.
Heal yourself many times.
Reach level 30.
Help to repair Gambler.
Defeat many enemies.
Defeat Henriette...
Defeat Kika.
Arrive at the crash site.
Destroy many innocent creatures.
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.
Have a chat with Relic.
Help Gili.
Reach Mabec.
Destroy many Roslock creatures in the pit.
Do a killer Painwheel juggle.
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.