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