Here is the full list of all 17 Sigi - there are A Fart for Melusina achievements.
In under 30 minutes?
Clear all caves.
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.
An apple a day...
Defeat Kolles Terrol.
Pocket 2500 coins.
Defeat the Steel Horse.
Kill 100 Zombies.
Find the long lost golden grail.
Defeat Blind John
Collect 1000 coins.
Fart at Melusina.