Here is the full list of all 14 Npc Problems: Vertex Coloring achievements.
All levels on the fourth package completed with the best solution!
Complete the spider web level.
Complete the ancient temple level.
Fourth package unlocked!
All levels on the third package completed with best solution!
Complete the spaceship level with best solution.
Complete the barrel level with best solution.
Third package unlocked!
All levels on the second package completed with best solution!
Complete the tension tower level with best solution.
Complete the level 12 with best solution!
Second package unlocked!
All levels on the first package completed with best solution!
Tutorial level completed!