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