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