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.
Heal yourself many times.
Defeat Kellunhelk.
Find Charley.
Obtain many weapons.
Defeat Old Singer.
Visit The Cut Machine.
Say goodbye to Mutt.
Help Gili.
Locate many Big Bots.
Receive a special gift from Molly.
Once again, help to repair Gambler.
Fully repair Gambler.
Reach level 30.
Have a chat with Relic.
Reach Mabec.
Continue to assist in the repair of Gambler.
Defeat Vek.
Bring a third part to Gambler.
Defeat Henriette again.
Defeat Elsom.
Help to repair Gambler again.
Defeat many enemies.
Help to repair Gambler.
Defeat Henriette...
Defeat Kika.
Defeat Dolly.
Arrive at the crash site.
Obtain many modules.
Obtain many Healing Cores.
Spend time with Pasha.
Get to know Saymund.
Get to know the crew.
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.