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