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