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