Here is the full list of all 42 Ghost Song achievements.
Receive a special gift from Molly.
Once again, help to repair Gambler.
Fully repair Gambler.
Defeat Vek.
Locate many Big Bots.
Destroy many innocent creatures.
Obtain many Healing Cores.
Visit The Cut Machine.
Have a chat with Relic.
Continue to assist in the repair of Gambler.
Defeat Henriette again.
Heal yourself many times.
Say goodbye to Mutt.
Defeat Elsom.
Bring a third part to Gambler.
Reach Mabec.
Reach level 30.
Do a killer Painwheel juggle.
Help to repair Gambler again.
Defeat many enemies.
Help to repair Gambler.
Defeat Henriette...
Defeat Kika.
Defeat Dolly.
Arrive at the crash site.
Defeat a Big Bot.
Help your friends escape.
Defeat Old Singer.
Defeat Kellunhelk.
Obtain many modules.
Obtain many weapons.
Spend time with Pasha.
Find Charley.
Get to know Saymund.
Get to know the crew.
Help Gili.
Destroy many Roslock creatures in the pit.
Complete the game on Original difficulty.
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.