Here is the full list of all 20 Steven Universe: Save the Light achievements.
Collect all other achievements
Experience an alternate sequence of events...
Save Light Steven and the Prism
Complete the game to 100%
Win the fight and then go out for pizzas!
Defeat any boss while wearing the CBF Badge
Recover every Lil' Light Steven
Travel to every zone
Fully upgrade all weapons at The Forge
Perform every fusion and team attack
Complete all the Fish Stew Pizza deliveries
Receive every fortune from BOLTRON: SON OF ZOLTRON
Help Vidalia finish her masterpiece
Defeat any boss without letting any party members be defeated
Deliver over 100 damage with one ability
Jump through a big donut
Defeat 100 Light Constructs
Perform 10 Perfect blocks in a row
Defeat three enemies with a single attack
Perform 10 Perfect attacks in a row