Here is the full list of all 12 Lucidity achievements.
Act I completed
Collected 100 Fireflies
First Level Completed
Act II completed
Act III completed
Collected 500 fireflies
Collected 1000 fireflies
Collected 1500 fireflies
Collect all the fireflies in 'Every Kite Soars' in a single run
Beat 'Deep Sleep Dive' without collecting any fireflies
Complete all Bonus Levels
Beat 'All Around is Petrified' without taking any damage