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