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