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