Here is the full list of all 13 Pilfer: Story of Light achievements.
Defeat the Smasher boss.
Defeat Neptune.
Defeat Jupiter.
Defeat Saturn.
Beat Pluto at her time trial.
Defeat the Solsnapper boss.
Defeat Caligo.
Change Pilfer's clothing.
Finish any level under 2 minutes.
Complete "More Jumps, More Fun" without using any wingshroud.
Complete all Challenge levels.
Knock an Armored Slasher into lava.
Finish any level without taking damage.