Here is the full list of all 17 Sigi - there are A Fart for Melusina achievements.
In under 30 minutes?
Clear all caves.
Find the long lost golden grail.
Collect all SIGI's.
There she goes again.
Defeat Ivan Stinkup.
Hard to find and almost out of reach.
Find the long lost golden crown.
Find the long lost golden talisman.
Pocket 2500 coins.
An apple a day...
Defeat Kolles Terrol.
Defeat the Steel Horse.
Collect 1000 coins.
Kill 100 Zombies.
Defeat Blind John
Fart at Melusina.