Here is the full list of all 11 PJ MASKS: HEROES OF THE NIGHT achievements.
Unlock a diorama in silver or higher.
Unlock a diorama in gold.
Unlock a diorama in bronze or higher.
Find all of the amulets in the City missions.
Find all of the amulets in the Moon.
Find all of the amulets in the Underwater Cave.
Find all of the amulets in the Flying Factory.
Unlock all dioramas in bronze or higher.
Unlock all dioramas in silver or higher.
Unlock all dioramas in gold or higher.
Complete all of the missions in PJ Masks: Heroes of the Night.