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