Here is the full list of all 12 Pid achievements.
Find 60 secret areas.
Complete the game.
Complete the game with all 12 secret souvenirs.
Find all the secret constellations.
Find 30 secret areas.
Collect 5 secret souvenirs.
Find 10 secret areas.
Find a secret constellation.
Enter the entourage HQ.
Defeat the Butler Orlando.
Collect 1 secret souvenir.
Complete game on hard difficulty.